Auto- (self)
Auto-
Self; by itself.
The lights in the corridor switch on automatically.
Autobiography
The story of your life, written by you.
Grandpa is writing his autobiography about life in a Kerala village.
Autograph
A person's own signature, often asked of someone famous.
Sana asked the author for an autograph at the book fair.
Remember: Auto- is Greek for 'self'. Autobiography = self + life + writing. A biography is written by someone else.