What are an index and a no-index tag?

Tags for "Noindex" Meta Robots

The "noindex" directive is typically used by webmasters to stop information that isn't meant for search engines from being indexed. Typical applications for "noindex" directives include: Pages that contain private data. eCommerce website checkout or shopping cart pages.

Robots can be instructed to index a page or not using the noindex and index meta tags, respectively. The crawler uses indexing to categorise and determine the purpose of each website's content. No matter how many websites link to a page, if a crawler does not index it, the page will be completely removed from the SERPs.