A user can see a log of login attempts on their account or on all accounts in their company if they are an admin. This is a useful feature to gauge how active users are and to determine if there may have been a security breach.
Go to Account in the top right-hand corner of the GUI and click on Administration.
A list of users will be displayed showing the last login for each user. For additional detail on attempted logins, both successful and unsuccessful, click on the user's name. A screen will be displayed (an example is shown below) with a log of recent logins.