You can use it to acces locked pages or to logout so you can't acces locked pages anymore.

Or to give acces to dynamic content object.

there is no more to it.

if you want to acces a locked page by clicking on it you get the login code automaticly but you can choose also to add the login / logout object so users can acces before clicking on the locked content then they get acces that way.

The locked pages can be set to certain users, these can be set in the acces management.

Here is also a lot of information:

https://guide.websitex5.com/en/support/search?term=login