It is more than your name, age, email address, home address or mobile number. Your personal information includes everything you share, post, send, upload and download on the web because these things tell people something about you.
Scary as it may sound, things you do online can never be completely deleted and all things you do online is potentially public.
Watch out for your friends, too! You play a part in creating your friends' digital reputations, too. Whenever you post videos, tag people in photos or comment on their profiles, you are actually sharing the private information about your friends with the world. Be a good friend and protect your friends' privacy online!