Meta tags are HTML elements, typically placed in the <head> of a page, that contain information about a web page that is not displayed to users. Meta tags provide metadata about a page, such as a description, keywords, or other information that is not provided elsewhere.
Meta tags are used across the web for a wide variety of reasons, but rose to prominence as Google encouraged site owners to place certain meta tags in the <head> of their websites to pass structured information to Google's web crawler, Googlebot. Though no longer in use by Google to the same degree (keyword meta tags have been almost entirely phased out because of SEO abuses), meta tags remain in use by major websites such as Facebook and other content sourcing platforms.
Swiftype has created a unique system of meta tags designed specifically for internal site search, which allows site owners pass custom structured data directly to Swiftbot as it crawls their website. With these meta tags site owners can augment—or completely alter—the set of fields Swiftbot extracts by default to better fit the data they wish to be indexed on their website.