What are external links? External links are links that point from one website to another. When your page links out to a different site, that is an outbound external link. When another site links to your page, that is an inbound external link, usually called a backlink. Used well, external links help readers find useful sources and help search engines understand what your page is about.
In This Article
- What Are External Links?
- Outbound Links vs. Backlinks
- What External Links Are Not
- Why External Links Matter for SEO
- They Help Search Engines Understand Context
- They Can Support Trust and Authority
- They Send Readers Somewhere Useful
- Best Practices for Building Quality External Links
- Link to Relevant, Trustworthy Sources
- Earn Links Instead of Buying Them
- Use Natural, Descriptive Anchor Text
- Keep Your Links Fresh and Working
- Use Nofollow, Sponsored, and UGC Attributes When They Apply
- Common External Linking Mistakes to Avoid
- Frequently Asked Questions
- Conclusion
What Are External Links?
An external link is a clickable link that takes a reader from one website to a page on a different domain. For example, if a bakery blog links to a flour supplier’s baking guide, that link is external, because it leaves the bakery’s website and lands somewhere else. The same is true in reverse: when a food magazine links back to that bakery blog, the bakery has gained an external link from another site.
The simplest test is the domain. If the link stays on the same website, it is an internal link. If it crosses to a different website, it is an external link. That distinction matters, because the two kinds of links do different jobs: internal links help people move around your own site, while external links connect your site to the wider web.
External links are one small part of search engine optimization (SEO). They are not a shortcut to higher rankings on their own, but they shape how readers and search engines experience your content, and they are worth handling with care.
Outbound Links vs. Backlinks
People use the term “external links” for two directions of travel, so it helps to separate them:
- Outbound links point from your website to another website. You choose where they go, what they say, and when they appear.
- Backlinks point from another website to yours. You do not control them directly. You earn them when other people find your content worth referencing.
From your perspective, an outbound link on your page is someone else’s backlink. Keeping the two directions straight makes link building easier to plan: you manage outbound links in your own content, and you earn backlinks through content, relationships, and reputation.
What External Links Are Not
A few common mix-ups are worth clearing up. External links are not the same as internal links, which connect one page of your site to another. They are not automatically advertisements, either: a normal editorial link to a source you found helpful is just a link, not an ad. And a social media share or mention is not an external link unless it is an actual clickable link to your page.
An external link can also carry an extra attribute, such as rel="nofollow", rel="sponsored", or rel="ugc". These attributes describe the relationship between the linking page and the destination. They do not change the basic fact that the link is external, and we cover when to use them later in this guide.
Why External Links Matter for SEO
External links matter because the web is built on connections. Search engines follow links to discover pages, understand topics, and judge how pages relate to one another. Used thoughtfully, external links support your content in three practical ways.
They Help Search Engines Understand Context
When you link out to a relevant source, you give search engines extra context about your topic. A page about email marketing that links to a respected email deliverability guide is clearly about email marketing, and the link helps confirm that. Outbound links work a bit like citations in a research paper: they show where your ideas connect to the wider conversation.
The same logic applies to the words around your links. Clear, on-topic writing and sensible keyword optimization for content marketing help search engines understand what a page covers, and your external links should match that same topic rather than pointing somewhere unrelated.
They Can Support Trust and Authority
When reputable websites link to your content, it is a positive signal. It suggests that other people found your page accurate, useful, or worth recommending. Over time, a steady pattern of such references can support your site’s reputation in your niche.
That said, quality matters far more than quantity. One link from a relevant, trusted site in your field is worth more than dozens of links from unrelated or low-quality pages. Nobody can promise a specific ranking gain from any single link, and chasing link counts for their own sake usually leads to poor decisions. Focus on earning links that a real person would find credible.
They Send Readers Somewhere Useful
External links are not only for search engines. Readers click them to check a source, dig deeper into a topic, or find a tool you mentioned. A well-placed outbound link saves the reader a search and makes your page more helpful. Backlinks work the same way in reverse: they send visitors from other sites to yours, which is one of the most natural ways to increase your website traffic.
Think of every external link as a recommendation. If you would not recommend the destination to a reader standing next to you, it probably does not belong in your article.
Best Practices for Building Quality External Links
Good link building is slow, deliberate work. The practices below will keep your outbound links helpful and your backlink profile healthy, without resorting to tactics that can cause problems later.
Link to Relevant, Trustworthy Sources
Link to pages that genuinely add something for your reader: an original study, an official help page, a clear explanation, or a tool you actually mention. Before linking, take a moment to check that the source is current, accurate, and maintained. A handful of strong, relevant links will serve your readers better than a long list of loosely related ones.
Relevance matters as much as reputation. A link from a well-known site means little if the page has nothing to do with your topic. Ask one question before adding any link: does this help the person reading this page?
Earn Links Instead of Buying Them
The links that last are the ones you earn. Publish content that other people want to reference, such as original guides, clear explanations, and practical examples. Build relationships in your niche, contribute genuinely useful guest articles, and let people discover your work. A solid content strategy and a clear SEO content strategy make this far easier, because content planned around real reader questions is the kind of content others link to.
Avoid buying links that are meant to manipulate search rankings. Search engines treat manipulative link schemes as spam, and Google’s spam policies describe link spam in plain terms. Updates such as the Google September 2026 spam update are a reminder that shortcuts in link building can backfire, sometimes long after the links were placed.
Use Natural, Descriptive Anchor Text
Anchor text is the clickable wording of a link. Good anchor text tells the reader where the link goes: a page title, a brand name, or a short descriptive phrase all work well. For example, “Google’s spam policies” tells the reader exactly what to expect, while a bare “click here” tells them nothing.
Vary your anchor text naturally. Using the same keyword-heavy phrase for every link to a page looks forced and can confuse readers. Mix in brand names, titles, and plain phrases, and let the surrounding sentence carry the context.
Keep Your Links Fresh and Working
Links go stale. Pages move, sites shut down, and sources become outdated. A broken or badly outdated link frustrates readers and makes a page look neglected. Check your older posts from time to time, fix or replace dead links, and update references that no longer reflect the current picture.
If you run a large site, make link checks part of your regular site maintenance. Learning how to find SEO errors on your website will help you catch broken links alongside other issues before readers do.
Use Nofollow, Sponsored, and UGC Attributes When They Apply
Most ordinary editorial links need no special attribute. But three situations call for one:
- Sponsored: use
rel="sponsored"for paid links, sponsorships, and advertisements. - UGC: use
rel="ugc"for links inside user-generated content, such as blog comments and forum posts. - Nofollow: use
rel="nofollow"when you link to a page you do not want to vouch for, or when you are unsure about its quality.
These attributes simply describe the relationship between your page and the destination. Using them honestly keeps your link profile clean and keeps paid relationships transparent.
Common External Linking Mistakes to Avoid
Most external linking problems come from a few avoidable habits:
- Linking to irrelevant pages. A link that has nothing to do with your topic confuses readers and search engines alike.
- Repeating the same keyword-heavy anchor text. It reads unnaturally and can look manipulative.
- Buying links or joining link schemes. Short-term gains can turn into long-term problems.
- Linking to outdated or broken pages. Check destinations before publishing, and re-check older posts.
- Stuffing a page with links. Every link should earn its place by helping the reader.
- Ignoring your older content. A post from years ago may still attract readers, so its links deserve the same care as a new post.
If you are unsure whether a link belongs, remove it. A page with fewer, better links almost always serves readers better than a page packed with questionable ones.
Frequently Asked Questions
Do external links help SEO?
They can help, as part of a broader SEO effort. Relevant outbound links give search engines context, and backlinks from reputable sites can support your site’s reputation. No single link guarantees a ranking change, and links work best alongside good content, sound technical SEO, and a clear site structure.
How many external links should a page have?
There is no fixed number. Include as many links as genuinely help the reader, and no more. A short article may need only two or three, while a long guide may naturally include a dozen. If a link does not help the reader, leave it out.
Do outbound links hurt my rankings?
Linking out to good, relevant sources does not harm your site. Search engines do not penalize pages simply for linking elsewhere. What can reflect poorly is linking to spammy, misleading, or irrelevant destinations, so choose your outbound links with the same care you give your own content.
What is the difference between external links and backlinks?
It is a matter of perspective. An external link is any link between two different websites. A backlink is an external link that points to your site from someone else’s. Every backlink is an external link, but not every external link is a backlink: your own outbound links are external links too.
Should I use nofollow on all my external links?
No. Ordinary editorial links to sources you trust do not need a nofollow attribute. Reserve rel="nofollow" for links you do not want to vouch for, rel="sponsored" for paid links, and rel="ugc" for user-generated content.
Conclusion
External links are simple in concept and powerful in practice. They connect your content to the wider web, give readers somewhere useful to go next, and help search engines understand what your pages are about. The best approach stays simple: link to relevant sources you trust, write natural anchor text, earn backlinks through genuinely useful content, and keep your links fresh over time.
Pair this with strong on-site linking by reading our companion guide on what internal links are and how to use them.
Want a stronger link profile? Explore our SEO services or talk to our team for a tailored strategy.