Outbound Link
An outbound link (also called an external link) is a hyperlink that points from a page on your own site to a page on a different domain. It cites authoritative material to strengthen a page's credibility and context, and it is distinct from inbound links that come into your site and internal links that connect pages within the same domain.
- An outbound link points from your site to an external domain and means the same thing as an "external link."
- It differs in direction from an inbound link, which another site points at your page, and an internal link, which connects pages within your own domain.
- Linking out to authoritative sources reinforces a page's credibility and its E-E-A-T signals.
- Use rel="sponsored" for ad or paid links, rel="ugc" for user-generated content, and rel="nofollow" when you want to avoid an endorsement.
- Google treats these rel values as ranking hints rather than absolute rules.
Overview
An outbound link is a hyperlink that connects one page on your site to a page on a different domain. The term is synonymous with "external link," and the two expressions refer to exactly the same thing. A typical example is a blog post linking to a government agency page or an industry research report as the source of a statistic.
Links are easiest to understand by direction. A link that another site points at your page is an inbound link (a backlink), and a link that connects pages within the same domain is an internal link. An outbound link, by contrast, leaves your domain and points outward.
SEO Significance
An outbound link works as a context signal that tells search engines what your content covers and which sources it trusts. Yoast explains that external links to clear, reputable sources support a page's experience, expertise, authoritativeness, and trust (E-E-A-T) and help search engines understand the relationships between pages, raising overall search quality. Yoast recommends including at least one followed outbound link in every post, and its SEO analysis flags content that has no external links.
Stuffing in irrelevant links, however, backfires. It is better to include only links that are topically relevant and blend naturally into the flow of the writing.
The rel Attribute: nofollow, sponsored, ugc
Google recommends three rel attribute values for marking the nature of an outbound link. Since 2019, these values have been treated as ranking hints rather than absolute directives applied at the crawling and indexing stage.
| Attribute value | Purpose | Typical case |
|---|---|---|
| rel="sponsored" | Marks paid links such as advertising, sponsorship, or other compensated placements | Ad banners, sponsored links, affiliate links |
| rel="ugc" | Marks links inside user-generated content | Links in comments or forum posts |
| rel="nofollow" | For when no other value fits and you do not want your site associated with or crawling to the linked page | An external page you want to avoid endorsing |
You can combine multiple values, separated by a space or a comma. Links carrying these attributes are generally not followed, though they may still be discovered and crawled through other paths, such as a sitemap or links from other sites.
<!-- Citing a trusted source: no attribute, followed -->
<a href="https://example.gov/research">Official research</a>
<!-- Sponsored / paid link -->
<a rel="sponsored" href="https://example.com/ad">Sponsored link</a>
<!-- User-generated content plus blocked follow -->
<a rel="ugc nofollow" href="https://example.com/comment-link">Comment link</a>Implementation Checklist
- Prefer linking to authoritative sources such as .gov and .edu pages or recognized industry references.
- Write anchor text that reads naturally and describes the link target.
- Check the credibility of a link target with metrics like Moz's Domain Authority (DA) or Ahrefs' Domain Rating (DR).
- Leave out links that are off-topic or feel forced.
- Apply rel="sponsored" to ad, sponsorship, and affiliate links, and rel="ugc" to user-generated content.
- Keep in-body links that cite trusted sources followed where possible, so the context signal is preserved.