This feature will allow you track how you have been using your Google account across many of Google's services. You can view devices and locations where you've logged in, what browsers and/or platforms you've used to do so and what authentication changes may have been made to your account. You can also view stats and trends in the emails you've sent and received, type of searches you've conducted and your top queries. So if you notice sign-ins from countries where you haven’t been or devices you’ve never owned, you can change your password immediately and sign up for the extra level of security provided by 2-step verification.
Google hopes this feature will help people better understand and manage their information on Google.
C'mon. Give it a try and tell us what you think.