Does any one know what doppelganger is?

I heard this thing at school about doppelganger what is it?|||Its another person that looks exactly like you, but in no way related.





Some people believe that every person has one somewhere on the planet..|||Basically another you...a copy, a double.





Here's the def. from Dictionary.com:





鈥搉oun


a ghostly double or counterpart of a living person.|||An artificial twin|||Yes. A fictional being that is an identical replica of you.|||It's German for 'look-alike' or 'twin'.|||a double