Page metadata is extra information that describes a webpage to browsers and other services. It is like a label on a package that tells you what is inside before you open it.
A page may have a title and a short description that can appear in search results. Browsers can also use information about the page to display it or share it appropriately.
Metadata is not the main article text people read on the page. It should describe that content accurately rather than promise something the page does not provide.