When we talk about the noindex tag, we’re referring to an element that informs search engines not to include a page or website in their index. Its main purpose is to prevent the site in question from appearing in search results. Generally, website owners use the “noindex” tag to prevent the indexing of content that isn’t intended to be visible to search engines. The most common method for telling search engines not to index a page is to include a Meta Robots tag in the section of an HTML page, adding the “noindex” directive. This looks like this: .