Notifications appear in the bell icon at the top right of the screen. They are composed of both User Notifications and System Notifications. The User notifications consist of messages such as a Playbook waiting for you to answer a question, or if somebody mentioned you on a case. Some of the notifications will have clickable links enabling you to go directly to the relevant place. 
You can also choose to configure what type of user notifications you want to receive, and where you want to receive them (Platform and/or Email). Note that the Case Status Changes notifications also includes notifications of overflow cases. 
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