Meta tags are pieces of text that describe a page’s content, they don’t appear on the page itself, but only in the page’s code.
Web performance often refers to the speed in which web pages are downloaded and displayed on the user's web browser.
A broken link or dead link, or 404 page, is a link on a web page that is expected to link to another web page but that page is unavailable.
the Google index lists all of the webpages that Google knows about.
Web Admin Media