Easier for Service Team to work through cases. It allows a multi tab and sub tab option with the Salesforce org, so you dont have to have multiple browser tabs open. So users can open for example Case A, then under Case A they can open the contact as a tab and the company as a tab. IF they want to look at Case B, they can open that as a separate tab next to Case A.
Also you can work with feed option in there, which normally is the focus for cases. So you can easily check what updates have been done on the case.
It will often also come with options like multi channel / macros etc.
It is all about making it easier and quicker for Service users to work through cases.