What's a Google Account? - YouTube Help
YouTube Help
What's a Google Account?
Google Accounts is a unified sign-in system that gives you access to:
» Free Google products, including iGoogle, Gmail, Google Groups, Picasa, Web History, YouTube, and more.
» AdWords and Google Checkout.
If you've used any of these products before, you already have a Google Account. To try new Google products, simply sign in with your existing Google Account. Your account username is the email address you entered when you created your Google Account. If you use Gmail, sign in with your Gmail username.
A note about Gmail: You do not need a Gmail address to have a Google Account; a Google Account may be associated with any active email address. However, signing up for Gmail will also give you a Google Account. Although creating a Google Account won't automatically give you Gmail, you can add Gmail to your existing account at any time. Gmail won't replace your current email address; however, it will become your primary address on your Google Account.
Link your existing YouTube account to your Google Account
Create a Google Account
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