It's like a clone of my phone? (dumb noobie question)

Android phones have a backup and restore function.
Settings>Privacy> Backup my settings and Automatic restore. These will backup to Google's cloud drive. Whenever you sign in to another device it will automatically restore all the settings previously saved, including wallpaper, notification ringtones (if factory ones) and applications downloaded from the market. You can uncheck these boxes to prevent his apps from appearing on your device, or create a gmail account and sign in under that