What Are Backlinks in SEO and Why Are They Important?

Backlinks are links from other websites to your website. They can help search engines discover your pages, understand what your content is about and assess whether other websites consider it useful. High-quality, relevant backlinks can support SEO, referral traffic and brand awareness, but their value depends far more on quality and context than quantity.

Backlinks are an important part of how SEO works in digital marketing. However, they can also be one of its most confusing areas, particularly when conversations start to include link authority, anchor text, referring domains and nofollow attributes.

This guide explains what backlinks are, why backlinks are important for SEO and what separates a useful recommendation from a link that provides little value.

What is a backlink in SEO?

A backlink is created when one website links to a page on another website. If another business, news publication or industry resource links to your website, your website has received a backlink.

The page containing the link is known as the source page. The page it points to is the target page or destination page. The website providing the link is also called a referring domain.

For example, imagine that a local newspaper publishes an article about independent businesses and links to a restaurant’s website. The newspaper’s article is the source page, the newspaper is the referring domain and the restaurant’s website is the destination.

From the restaurant’s perspective, that link is a backlink. From the newspaper’s perspective, it is an external link.

A backlink connects a source page on one website to a target page on another.

How are backlinks like real-world recommendations?

Before smartphones and search engines made local information instantly available, you might have driven into an unfamiliar town and stopped at a petrol station to ask where you could get something to eat.

If the person behind the counter recommended a nearby restaurant, you would probably treat that recommendation as useful. They know the area, the restaurant is relevant to your question and there is a clear reason for them to point you in its direction.

That recommendation was not literally a backlink, but it demonstrates a similar principle. The petrol station acts like the referring source, while the restaurant is the destination being recommended.

If several independent local people recommended the same restaurant, you might feel even more confident about visiting it. Hearing the same recommendation ten times from one person would be less convincing than receiving it from several knowledgeable sources.

Relevance matters too. A recommendation from someone familiar with local restaurants is likely to be more helpful than one from somebody who has never visited the town. In much the same way, a backlink from a relevant and reputable website will usually be more meaningful than a link placed on an unrelated page with no genuine reason to mention your business.

Search engines use much more sophisticated systems than this simple comparison suggests, and backlinks are only one group of signals among many. However, the analogy helps explain why the source, context and reason for a link matter more than simply counting how many links a website has.

A useful backlink works like a relevant recommendation from someone familiar with the subject.

What is the difference between an internal link, an external link and a backlink?

The terms are closely related, but they describe links from different perspectives. Internal links connect pages on your own website, while external links direct visitors to a different website. A backlink is an external link viewed from the perspective of the website receiving it.

Internal links also help visitors and search engines find related pages and understand how your content fits together. Our guide to internal linking for SEO explains this in more detail.

Put simply: a single link can be both an external link and a backlink. It is an external link to the website publishing it and a backlink to the website receiving it.

Why are backlinks important for SEO?

Backlinks can help search engines discover pages, understand their subject matter and evaluate how websites relate to one another. They can also send visitors directly to your website and introduce your business to people who may not have encountered it otherwise.

The benefits of SEO backlinks generally fall into five areas.

1. They can support the reputation of a page

When a reputable website chooses to link to a page, that decision can indicate that the page contains something worth referencing. It might offer useful research, a clear explanation, an original resource or relevant expertise.

Google has historically used link-based systems, including PageRank, as part of the way it understands the web. This does not mean that every backlink improves rankings or that the page with the most links automatically wins. Search engines consider numerous signals, and different links can carry very different levels of value.

2. They help search engines discover content

Search engine crawlers follow links to move between pages. A link from an existing page can therefore provide another route through which a new or updated page may be found.

A backlink does not guarantee that Google will crawl, index or rank the destination. Technical accessibility, content quality and the wider website still matter. However, links contribute to the connected structure that allows users and search engines to move around the web.

3. They provide context

The website providing a link, the subject of its page, the surrounding paragraph and the words used in the link can all provide context about the destination.

For example, a catering industry publication linking to a restaurant supplier within an article about commercial kitchen equipment creates a clear topical relationship. An unrelated link hidden among hundreds of miscellaneous websites provides far less useful context.

4. They can generate referral traffic

People can click backlinks as well as search engine crawlers following them. A well-placed link on a page that attracts the right audience can send genuinely interested visitors to your website.

This traffic can be valuable even if the link has little direct effect on rankings. A prospective customer arriving through a trusted industry publication may already have some understanding of your business and a reason to explore it further.

5. They can increase awareness of your business

Being referenced by relevant publications, organisations and industry websites can place your name in front of new audiences. Over time, this exposure may contribute to brand recognition, direct visits, searches for your business and new commercial relationships.

This is why a good backlink strategy should not focus exclusively on ranking positions. The best links often have value for real people before any potential search benefit is considered.

What makes a high-quality backlink?

There is no single number that defines a good backlink. Its potential value depends on the source, the page, the context, the destination and the reason the link exists.

A useful question to ask is: would this link still be helpful if search engines did not exist?

If it would guide an interested reader to a genuinely useful resource, it probably has a sound reason to exist.

The strongest backlinks combine relevance, credibility, context and genuine value for the reader.

Relevance

A backlink should make sense in its setting. Relevance can exist at several levels:

• The linking website should have some connection to the subject or audience.
• The source page should cover a related topic.
• The surrounding paragraph should explain why the destination is useful.
• The anchor text should help the reader understand what they will find.
• The destination page should fulfil the expectation created by the link.

A link does not have to come from a website in exactly the same industry. A local business could reasonably receive links from regional news websites, suppliers, professional organisations, charities or event websites. What matters is whether there is a credible relationship and a genuine reason for the reference.

Editorial choice

An editorial backlink is included because a writer, editor or website owner has chosen to reference the destination. The link supports the content or helps the reader complete a task.

These links are generally more meaningful than links that anybody can add without review. They demonstrate that somebody responsible for the source page decided the destination was worth mentioning.

Source credibility

A link from an established, trustworthy website can carry more weight than a link from an anonymous website created purely to publish links.

Credibility is not determined by size alone. A small trade association, respected local publication or specialist industry website may be highly relevant to a particular business, even if it does not attract a national audience.

Placement and context

A link placed naturally within a useful article usually provides more context than one hidden in a footer or included in a long list of unrelated links.

The surrounding copy should make it clear why the destination is being recommended. This helps readers decide whether to follow the link and gives search engines more information about the relationship between the pages.

Destination quality

The page receiving the backlink must be worth visiting. It should answer the question implied by the link, load properly and offer accurate, useful information.

Sending every backlink to a homepage is rarely the best approach. If somebody is referencing a specific guide, product, study or service, the link should normally take the reader directly to that resource.

What is anchor text?

Anchor text is the visible, clickable wording used for a link. In this sentence, Google’s link best practices is the anchor text.

Useful anchor text tells readers what to expect after clicking. It should sound natural within the sentence and describe the destination where appropriate.

Trying to force the same keyword-rich anchor text into large numbers of backlinks can look unnatural. A normal backlink profile may contain a mixture of business names, page titles, descriptive phrases, web addresses and general wording because different people link in different ways.

There is no universal “safe” percentage for each type of anchor text. Context and editorial intent are more useful considerations than trying to achieve an invented ratio.

What is the difference between backlinks and referring domains?

A backlink is an individual link. A referring domain is a website that provides one or more of those links.

If one newspaper links to your website from ten different articles, that creates ten backlinks from one referring domain. If ten separate newspapers each link once, that creates ten backlinks from ten referring domains.

This returns us to the restaurant comparison. Ten recommendations from the same person are not identical to recommendations from ten independent people. The same applies online, although search engines also evaluate the quality, relevance and context of every source rather than relying on a simple domain count.

Both measurements can be useful when reviewing a website, but neither should be considered without context.

What types of backlinks are there?

Backlinks can appear in many different places. Common examples include:

• Editorial links: references added naturally within articles, guides and reports.
• News and media links: links included when a publication covers a business, announcement or expert comment.
• Resource links: links from useful lists, directories or resource pages.
• Business citations: links from genuine trade bodies, professional profiles and relevant business directories.
• Partner and supplier links: references created through real working relationships.
• Image attribution links: links crediting the creator or source of an image, chart or graphic.
• User-generated links: links posted in forums, community websites and comment sections.
• Sponsored links: links associated with advertising, sponsorship or another commercial arrangement.

The type alone does not decide whether a backlink is useful. An editorial link can still come from a poor-quality website, while a listing in a genuine specialist directory could help prospective customers find a trusted supplier.

What do nofollow, sponsored and UGC links mean?

Website owners can add attributes to links to explain their relationship with the destination.

• Standard link: a normal link without a qualifying attribute. It is sometimes called a “dofollow” link, although dofollow is not an HTML attribute.
• Nofollow: uses rel="nofollow" when a publisher does not want to associate its website with the destination in the usual way.
• Sponsored: uses rel="sponsored" for links created through advertising, sponsorship or another paid arrangement.
• UGC: uses rel="ugc" for links within user-generated content, such as forum posts and comments.

Google treats these attributes as hints when interpreting links. A nofollow link can still bring referral traffic, raise awareness and help people discover your business, so it should not automatically be viewed as worthless.

Paid recommendations need to be treated differently from independent editorial ones, just as you would want to know if the person recommending the restaurant had secretly been paid to do so. Links connected to payment or sponsorship should be qualified appropriately.

What is a backlink strategy?

A backlink strategy is a plan for earning, attracting and managing links from relevant websites. A sensible strategy starts with understanding what your audience and industry would genuinely find valuable.

Rather than asking, “How can we create as many backlinks as possible?”, ask, “What could we produce or do that reputable websites would have a valid reason to mention?”

Potential approaches include:

• Publishing original research, statistics or survey findings.
• Creating detailed guides that answer common industry questions.
• Developing useful tools, templates, checklists or calculators.
• Offering informed expert comments to relevant journalists.
• Building genuine relationships with trade publications and professional organisations.
• Promoting newsworthy company developments.
• Correcting inaccurate or broken references where your content is a suitable replacement.
• Making sure legitimate business and professional listings are complete and accurate.

Strong content writing can provide the resources that other websites want to reference. However, simply publishing another general blog post does not mean backlinks will appear automatically. The content needs a clear audience, a useful angle and a reason to be cited instead of the many alternatives already available.

Newsworthy developments can also be communicated through press releases. A strong story may lead to media coverage and online mentions, but publication and backlinks are never guaranteed. Editors decide whether a story is relevant to their audience and whether a link adds value.

A sustainable backlink strategy starts by creating something that relevant publishers and their readers will value.

Which backlink practices should you avoid?

Problems arise when links are created primarily to manipulate search rankings rather than help users. Google includes link spam within its official spam policies for web search.

Practices that may create unnecessary risk include:

• Buying links that pass ranking credit without appropriate qualification.
• Taking part in excessive link exchanges.
• Using automated programs to create large numbers of links.
• Publishing low-quality guest articles solely to insert backlinks.
• Hiding links or placing them where users are unlikely to see them.
• Adding irrelevant keyword-rich links to forums and comments.
• Creating networks of websites for the main purpose of linking between them.

Not every unfamiliar or low-quality backlink pointing to your website is a reason to panic. Websites naturally attract links they did not request, and Google’s systems are designed to assess them.

The term “toxic backlink” is commonly used by SEO platforms, but it is not a standard Google classification. A tool’s warning can provide a reason to investigate a link; it is not proof that the link is harming your website.

Google’s disavow tool is intended for limited and advanced situations. It should not be treated as routine website maintenance or used simply because a reporting tool has labelled some links as suspicious.

What can backlinks do beyond improving rankings?

Although backlinks are usually discussed in relation to SEO, a valuable link can produce several business benefits:

• Sending potential customers directly to a relevant page.
• Introducing your business to a new audience.
• Associating your organisation with a trusted publication or industry resource.
• Supporting partnerships and professional relationships.
• Generating mentions and branded searches.
• Helping useful information travel between websites.

These benefits also explain why a backlink can be worthwhile even if it does not produce an obvious ranking change. Links are part of how people discover and evaluate information online, not merely a technical SEO measurement.

What can backlinks not do?

Backlinks cannot compensate indefinitely for a poor website. They do not guarantee rankings, crawling, indexing, enquiries or sales.

A website still needs useful content, a sound technical foundation, clear navigation and pages that satisfy the visitor’s needs. Search engines consider many signals when deciding which pages to display, and competitors may improve their websites at the same time.

Backlinks also do not guarantee that content will be selected for an AI-generated search result or cited by an AI system. Relevant references may contribute to wider authority and discoverability, but selection depends on the system, query, content and numerous other factors.

How can you check your website’s backlinks?

Google Search Console provides a Links report showing a selection of external links, commonly linked pages, linking websites and link text. It is a useful starting point for website owners because the information comes directly from Google.

Third-party SEO platforms can provide additional backlink information, although different tools maintain different indexes and may therefore report different totals.

When reviewing the results, look beyond the headline backlink number. Consider:

• Which websites are providing the links?
• Are the source websites and pages relevant?
• Which pages on your website attract links?
• Do the links appear to have a genuine editorial purpose?
• Could people reasonably click them?
• Are most links coming from only a few referring domains?
• Has an important link disappeared or changed?

You may also encounter measurements such as Domain Authority, Domain Rating and Authority Score. These are estimates developed by Moz, Ahrefs and Semrush respectively. They can help with comparisons, but they are not Google metrics and should not be treated as direct measurements of how Google values a website.

Third-party backlink tools can show which domains link to a website alongside estimated authority, traffic and backlink metrics.

Common backlink myths

More backlinks always lead to better rankings

No. A large collection of irrelevant or artificial links is not necessarily useful. A smaller number of appropriate links from credible sources can provide far more meaningful context and referral value.

Every backlink passes the same value

No. Links differ according to their source, relevance, placement, attributes, destination and reason for existing. Two visually similar links can have very different contexts.

Nofollow links are worthless

No. They may still send visitors, raise awareness and connect people with useful information. The nofollow attribute helps search engines interpret a link; it does not prevent people from clicking it.

Every low-quality backlink must be removed

No. Websites can receive unwanted links without doing anything to create them. An unfamiliar backlink is not automatically harmful, and deleting or disavowing links without understanding the situation can create unnecessary work.

A high authority score guarantees a good link

No. Third-party scores are estimates. They do not replace a manual review of the source page, relevance, audience, editorial quality and destination.

Frequently asked questions about backlinks

How many backlinks does a website need?

There is no universal number. The level and type of competition vary between subjects, locations and industries. Instead of chasing a fixed total, compare the relevance, quality and diversity of your links with the websites competing for the same audience and searches.

How long do backlinks take to affect SEO?

There is no set timeframe. Search engines need to discover and process the link, and any effect will depend on the source, destination, competition and wider quality of the website. Some links may send referral traffic quickly without producing a measurable change in rankings.

Can you rank without backlinks?

Yes, particularly for specific or less competitive searches. Useful content, technical accessibility and strong relevance can be enough in some situations. However, reputable backlinks may help a page compete