How rel sponsored works
The rel attribute on a link describes the relationship between the two pages. The value sponsored says the link exists because of a commercial arrangement: money changed hands, goods were supplied, or the placement is part of an affiliate programme. It was introduced alongside the ugc value so publishers could be specific about why a link should not be read as a plain editorial endorsement.
It affects how the link is weighed, not whether it is allowed. A sponsored link is a perfectly legitimate thing to publish; the marker simply tells search engines to discount it as a vote. Values can be combined where a link belongs in more than one category, and the marker sits alongside — never instead of — the visible disclosure your readers and your advertising regulator expect.
Why rel sponsored matters
Unmarked paid links are one of the clearest breaches of Google’s spam policies, and the risk falls on both parties. A site that sells links without marking them can find its ability to pass value withdrawn, which quietly destroys the product it was selling. A buyer whose profile fills with unmarked paid placements is building on a foundation that can be removed at any time.
Marking properly also keeps you honest about what you are buying. Once a placement is labelled, its value has to come from the audience reading it. That is a healthier question than asking what a tool says the domain scores, and it usually leads to better decisions about where to spend.
Common mistakes with rel sponsored
The most common is silence. Affiliate links in reviews, gifted product write-ups, paid guest posts and sponsored press releases all fall inside the definition, and they are routinely published unmarked because nobody wanted to raise it with the client. Ambiguity is not a defence: if the link would not exist without the commercial arrangement, mark it.
The second mistake is marking one and missing the rest. A sponsored article often carries several links to the same advertiser, in the body, in an author box and in an image. Every one of them needs the value.
The third is treating the marker as a substitute for disclosure. Search engines read the markup, but readers cannot see it, and advertising rules in most markets require a visible statement that content is paid. Do both. The fourth is confusing sponsored with rel ugc, which is for links your visitors post, not links you sold.
How to act on it
Write the rule down and give it to whoever publishes. Any link arising from payment, free product, event hosting or an affiliate programme gets marked and disclosed; ordinary editorial links do not. If your site runs advertising, set the marker in the template or the plugin that inserts the links so it cannot be forgotten.
When you are buying rather than selling, ask what the marking policy is before you commit, and treat an offer to leave a paid link unmarked as a warning about how that publisher operates generally. Judge the placement by the readers it reaches. If your aim is to earn links that need no marker at all, that is the work described under link building.