What is difference between autograph and sign?

Answer 1

Signature = Name that is signed to acknowledge a purpose.

Autograph = Name that is signed for no purpose but may have material or sentimental value.

Answer 2

a autograph is from some one rather famous. a sign is rather for permission

Answer 3

An autograph is a person's hand signed signature. originally signed. A hectograph is a copy. A printing process to transfer an original, as carbon paper.