See the documentation: https://www.postgresql.org/docs/current/backup.html

all of these various 3rd party backup tools use these things. Mostly it's QOL stuff that you get from a 3rd party tool. We use barman, very happily: https://pgbarman.org/

Postgres is very "unix-y" in that everything is a separate tool. It has backup interfaces and commands but doesn't ship with a comprehensive backup management solution.