Backlinks are important in SEO because they help search engines discover pages, understand their relevance and assess their credibility. A backlink is a link from another website to a page on your website.

Backlinks support four practical SEO outcomes:

  1. Search engines can discover new or updated pages.
  2. Link context can clarify what a page covers.
  3. Relevant links can support a page's authority.
  4. People can visit your site through the link.

Google uses links as one signal when assessing page relevance, and its crawlers use links to find new pages. Links matter, but they are only one part of SEO. A few relevant, editorially earned backlinks can be more valuable than hundreds of unrelated or artificial links.

Benefit How backlinks help
Page discovery Crawlers can find new or updated pages through links
Relevance Anchor text and surrounding content add context
Authority Links from respected websites can support a page's importance
Referral traffic Readers can click through to your website
Competitive visibility Relevant links can help a page compete in crowded results

Backlinks improve SEO in four main ways: they support discovery, add context, contribute to external authority signals and send referral traffic.

1. Backlinks Help Google Discover and Crawl Content

Search engines follow links between webpages. When another website links to a new article, product page or service page, the link can help crawlers find that URL.

Google says it uses links to find new pages to crawl. It also recommends using a standard HTML <a> element with an href attribute so links are crawlable.

Backlinks can be useful for:

  • New websites with few links pointing to them
  • Newly published pages
  • Deep pages several clicks from the homepage
  • Content that is not prominent in the site's navigation

A backlink does not guarantee indexing or rankings. The destination page still needs useful, accessible and relevant content.

A backlink can act as an external reference. If an established website links to a page because it helps explain a topic, that link can contribute to how search engines assess the page's importance.

Google says one quality factor involves understanding whether other prominent websites link to or refer to a piece of content. Its search documentation also identifies PageRank as one of many signals used in Search, not as the only ranking factor.

A backlink is not automatically an endorsement. Its value depends on factors such as:

  • The relevance of the linking website
  • The topic of the linking page
  • Whether the link was placed editorially
  • The surrounding text and anchor text
  • The quality of the destination page

For example, a link from an industry publication discussing your subject is generally more useful than a link from an unrelated directory with many low-quality entries.

Anchor text and the words around a link give readers and search engines more information about the destination page.

Examples include:

  • "Technical SEO audit" gives clear context for a page about technical audits.
  • "Click here" says little about the destination.
  • A link from a local SEO article to a Google Business Profile guide creates a clearer topical connection than a link from an unrelated entertainment website.

Google recommends concise, descriptive and relevant anchor text.

Anchor text should still sound natural. Repeating the same commercial keyword across many backlinks can appear manipulative and create a link spam risk.

A backlink can send interested visitors directly to your website, even when it does not contribute much ranking value.

A link from an industry association, specialist publication or popular newsletter may put your business in front of people who already care about your subject. Those visitors might:

  • Read another article
  • Subscribe to an email list
  • Request a quote
  • Book a consultation
  • Buy a product

That makes backlinks both an SEO asset and a traffic source. Judge a link by the audience it can reach, not only by the authority score assigned to it by an SEO tool.

A valuable backlink is relevant to the destination page, placed for a clear editorial reason and useful to the linking page's readers.

The strongest links usually have several of these characteristics:

  1. Topical relevance The linking website and page cover a subject related to the destination page.

  2. Editorial placement The publisher links to your content because it helps explain or support the topic.

  3. Descriptive context The surrounding text gives readers a reason to visit the destination.

  4. Audience value The linking page attracts readers who may benefit from your content, product or service.

  5. A strong destination page The link leads to a page that answers the reader's next question or meets their need.

  6. A natural link profile The site earns links from different relevant sources rather than collecting large numbers of similar links in a short period.

Metrics such as Domain Rating, Domain Authority and Authority Score can help compare websites. They are proprietary estimates, though. They are not Google's published ranking scores and should not replace an assessment of relevance, editorial quality and potential referral traffic.

No. Backlink quality and relevance matter more than raw quantity.

One relevant link from a trusted publication may be more useful than hundreds of links from unrelated websites. Google classifies links created mainly to manipulate rankings as link spam. Examples include paid links without the correct qualification, excessive link exchanges, automated links and large-scale guest-post campaigns created mainly for SEO.

Google has also said that its systems can neutralize unnatural links. Artificial links may provide no ranking benefit, and violations can sometimes lead to lower rankings or removal from search results.

Treat link building as a relevance exercise, not a numbers game. The link should make sense to the people who encounter it.

A standard backlink has no special rel attribute. Google can crawl and evaluate it as a regular link.

Other attributes describe the relationship between the publisher and the destination:

  • rel="sponsored" identifies advertising, sponsorships and paid placements.
  • rel="ugc" identifies user-generated content, such as forum posts and comments.
  • rel="nofollow" tells Google that the publisher does not want to imply a standard endorsement.

Google treats these attributes as hints when evaluating links. Paid links should use sponsored or nofollow, while user-generated links should generally use ugc or nofollow.

A nofollow or sponsored link can still bring referral traffic, visibility and brand awareness. Its value is not limited to its possible ranking contribution.

Yes. Backlinks remain relevant because search systems still need to discover, interpret and assess web content. A backlink does not guarantee that a page will appear in an AI Overview or be cited in an AI-generated answer.

Google says its ranking systems use many signals, including relevance, usability and source expertise. Its spam policies also cover attempts to manipulate generative AI responses in Search.

For visibility in traditional and AI-assisted search, create content that is:

  • Original and factually accurate
  • Clearly structured
  • Written for a specific search intent
  • Supported by credible sources
  • Easy for readers and search engines to understand

The safest approach is to create something worth referencing and then put it in front of relevant audiences.

Methods include:

  • Publishing original research, data or survey findings
  • Creating detailed industry guides
  • Producing calculators, templates or other useful tools
  • Offering expert commentary on important developments
  • Reclaiming unlinked brand mentions
  • Replacing broken links with an improved resource
  • Building relationships with relevant journalists, publishers and organisations
  • Sharing useful content in professional communities

Google recommends creating unique, compelling content that people want to link to naturally.

The Practical Takeaway

A backlink is worth pursuing when it helps the linking page's readers and fits the topic naturally. Prioritise relevant, editorially earned links from websites with an audience that may care about your content.

Do not buy large quantities of low-quality links or rely on automated schemes. Backlinks can support discovery, relevance, authority and referral traffic, but they cannot make up for poor content, technical problems or a weak user experience.