Meta Keywords
Meta Keywords are a type of tag that webmasters can use to indicate to search engines the main keywords of a web page.
More precisely, they are a list of keywords, usually separated by commas, to be placed in the <meta> tag in the <head> section of a page. with relevance to the content.
However, due to their past abuse by black hat SEOs, many search engines, including Google, no longer consider meta keywords in their ranking algorithm.