What is the Difference Between a Follower and a Listener in the OMS?

Follower - CC like ZenDesk - Will get notifications and emails regarding the Line Item. They can see (view only) information on the ticket such as status, general tab, allocations

Listener - Someone who has access to the Line Item but cannot see any information other than the message. They will only get notifications for communication and nothing else.

Both users can communicate over messages