The tab gives you a convenient way to display and work with identity information yourself. It enables your organization to be more responsive by giving you access to the information you need whenever you need it. For example, you might use the tab to:
Manage your own user account directly
Look up other users and groups in the organization on demand
Visualize how those users and groups are related
List applications with which you are associated
Your system administrator is responsible for setting up the contents of the tab for you and the others in your organization. What you can see and do is typically determined by your job requirements and your level of authority.