2-step Verification,
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By enabling the 2-step verification from you Gmail account makes your account more secure by making you to login into Gmail by 2 step. While logging in into the Gmail account, Gmail send you the security code to your mobile phone and asks you to enter that code in Gmail login page. This makes sure that only the mobile phone carrier can able to know that code. So your account cannot be Hacked if someone tries to hack your account from somewhere else.