We use it for client ticketing. We have managed services agreements with clients, and we use it when they have issues. It consolidates well with their IT ticket system. We are the first pass on the ticket issues. If it seems that a ticket belongs to them, we can easily pass it onto their system and their people. So, it is a ticket system for our clients.
We are using its cloud version, and it is hosted in Atlassian's cloud system.