Multiple sessions & Authlogic

From GitHub - binarylogic/authlogic_example: An example rails app using the Authlogic authentication library


So lets assume you are setting up a session for your User model. You can
call this anything you want, but I recommend naming it after the model
you are authenticating with, this way if you want to add multiple
session models down the road you can easily do this without have name
clashes.


What does “multiple sessions” and or “mutiple sessions model” mean in
this context?