Your Google account need a username and Password for you to login as of now, username is usually email address (only Username if it is Gmail), and password you choose. Hackers & spammers all around the world are using various ways to get into your Google account to use them for their own benefit. It includes various ways like Intrusion, through spywares, or social engineering.
But Now your Google account is more secure and protected, as Google has decided to roll out 2 step security for their Google Account users. This will not only protect your account from these malicious people, but will reduce the spam originated form Google account as well. Because with this system in place A hacker need to go through second step verification which is not possible in most cases unless he is someone known by you or close to you. For spammers also having so many devices to complete second step will be costly and hence simply impossible.