A Google-wide username and password that can be used to access various products, including AdMob. Your Google Account also contains information that applies across products, such as your preferred language and some privacy settings.
If you created an AdMob account or have signed in to access any Google product, then you've created a Google Account. You can view and change the information in your Google Account at any time by signing in at google.com/accounts.
Learn more about creating a Google Account.