A noindex tag is an HTML meta tag used to prevent a web page from being indexed by search engines. When a search engine crawler encounters a noindex tag, it knows not to include that page in its search results.
To implement a noindex tag, you need to add a meta tag within the
section of your HTML document. The tag looks like this: <meta name="robots" content="noindex">
Example use cases for noindex are:
- Thank You Pages: Pages that users see after submitting a form.
- Admin or Login Pages: Administrative or login pages that don't need to be indexed.
- Internal Search Results Pages: Pages displaying internal search results, which can create duplicate content.