There are plugins or extensions that produce a family of files named sitemap.

Every CMS has its own

You must inform the big search site like Google, Yandex, e.t.c. for your site by sending them your sitemap.

The way of populations is different for every big site, you must read, or communicate with the web master.

This is an example of a site map:

https://edu.wplecturer.com/sitemap.xml