INFO: What is a Google Account?
Description: Details on why a Google Account is import to have if you use Google's services or an Android device. A Google Account is a unified login for all Google services.
As you can see there are a lot of Google Services, this is why Google created an account that allows you to log in once and keeps your personalized settings between every services that they provide. Also it allows you to sync all of your Android devices and Google Play purchases. This is great if you have an Android phone and tablet because for example if you purchase a movie from Google Movie on your phone you can watch it without having to purchase it again on your tablet. Having a Google Account ties this all together under a unified login.