Google Authenticator works with 2-Step Verification for your Google Account to provide an additional layer of security when signing in.
Google knows almost everything about you, with your account associated with it, Google services hold almost all the information you have uploaded on the internet such as your photos, emails, personal contacts, your tasks, and much more.
Without much security any eavesdropper could get access to the important information from your account. Mostly people use their Gmail account as the reference email-id while signing up for different accounts, but hacker could request a password change for your accounts like Facebook, Twitter, Skype and more.
What is Google Authenticator?
One more thing you can have more than one Google account associated with the same Google authenticator app.
Download : Google Authenticator