Now a days is more and more complicated, to protect your passwords, mails, contacts and important data. That’s why along with any android antivirus system that you may have installed on your smartphone or pc, it’s highly recommended that you use 2-step verification codes.
Google Authenticator generates 2-step verification codes on your phone, codes that you will have to use when you are signing in in your gmail account or other website using your gmail account, in this way your mail is protected from hijacking and other types of password stealing hacks and robots.
You can set up your google authenticator following the next link accounts.google.com/SmsAuthConfig
In the video below Google Authenticator is explained in more detailed, what it is and how to set it up.
The Google Authenticator application is available for free on android google play and also on iTunes if you have a iPhone or other iOS device.