Clients help you to easily see for whom you are doing a certain project. This is also a good way for your team to see if you are working on an internal or external project. Furthermore you will find an overview about all projects for a certain client in the detailed client view.
If you click on a clients name you will be forwarded to the clients detais. Here you have an overview about all the contact information (1) and the active projects (2) of this client. You can also switch to the overall project overview (3) for the client to filter for certain projects and see inactive projects, too.