Part of macOS

`loginwindow`Your login session

○ Leave it

Keeps your login session running.

What it is

Looks after your session: logging in and out, the lock screen, and restarting apps after a crash.

If you stop it

Stopping it logs you out straight away and closes every app. Leave it.

○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.

From Procession’s guide, in the words the app shows.