Nofollow

Nofollow is a link attribute that tells search engines not to pass ranking credit through a particular link. When a link carries the nofollow value, it signals to crawlers that the linking site does not necessarily vouch for the destination and does not want its own authority to flow to that page. The link still works normally for people who click it, and it can still send referral traffic, but for the purposes of ranking authority, it is meant to be treated as a link that does not transfer value.

Mechanically, nofollow is applied through the rel attribute of an anchor element, with the value set to nofollow. Search engines reading the page see that instruction and, historically, would not follow the link for ranking purposes or pass authority through it. Over time, major search engines have described nofollow as a hint they may interpret rather than a strict command, and they introduced more specific related values to distinguish sponsored links and user-generated content. The core idea remains the same: nofollow marks a link the site does not want counted as an endorsement, which is why it contrasts with an ordinary dofollow link that does pass value.

The attribute was coined by Google in 2005, combining "no" with "follow" to instruct crawlers not to follow or pass credit through a link. It was created largely to combat comment spam, giving site owners a way to link to pages, or to allow user-submitted links, without handing out ranking authority to spammers who flooded blog comments and forums with links. It quickly became a standard tool for handling links a site could not fully vouch for, including paid placements, sponsored content, and links in user-generated areas.

For a business, nofollow matters because it shapes both how you use links on your own site and how you interpret links pointing to you. On your own pages, applying nofollow or the more specific sponsored and user-generated values to paid or untrusted links helps you stay within search engine guidelines and avoid looking as though you are selling authority. On the receiving side, understanding that many links are nofollow tempers expectations: a mention from a large platform may bring valuable traffic and exposure without directly boosting your rankings, and that is still worthwhile. Recognizing the difference helps you evaluate the true impact of your link-earning efforts.

There are important nuances. A common mistake is dismissing nofollow links as worthless; they can drive real referral traffic, build brand awareness, and contribute to a natural, diverse link profile that looks healthy to search engines. In fact, a backlink profile made up only of authority-passing links can appear engineered. Another mistake is misusing nofollow internally, such as trying to sculpt the flow of authority within your own site by marking internal links nofollow, a tactic that is generally outdated and counterproductive. Failing to mark paid or sponsored links appropriately is a more serious error, since undisclosed paid links that pass authority can draw penalties. It helps to view nofollow alongside related ideas such as anchor text, ordinary links that build authority, and the broader work of link building. The practical approach is to use nofollow and its related values honestly for links you cannot vouch for, and to value nofollow links for the traffic and exposure they bring.