Google has rolled out a new feature called Google Account Activity which gives you access to monthly summary of your account activity across many Google products. This feature is not enabled by default and you need to opt-in to get access to monthly reports. This monthly report or summary is quite helpful if you want to know what’s going on with your Google account, e.g. how many emails you have sent and received, how often you have searched on Google, from which countries you have logged in and how often your YouTube videos have been viewed.

Google Account Activity reports are password-protected with insights into your signed-in use of Google services. These reports summarize all your data across your Google account – e.g. sent emails or top searches. These reports can be deleted at any time. This report provide details like Authentication changes, your Locations, browser type, platforms etc of your logins along with details on number of emails being sent and received, web searches etc.

You can optin for this feature at Google Account Activity setting page. First report will need sometime to get generated and then emailed to you.

You will notice any suspicious activity easily if something wrong is going on with your account.  For security of your account, you must enable the 2 step authentication feature of Google accounts so that even if someone gets your password, he cant login to your account.

Via: Google Blog