The marks made by the skin on the ends of a person's fingers. These marks are different for each person and can be used to identify them.
Fingerprints are often used in detective stories and police work to solve crimes.
Examples:
My fingerprint is on the glass.
The detective found a fingerprint on the doorknob.
She left her fingerprint on the paper.
I can't open my phone because it needs my fingerprint.
In the story, the thief left a giant fingerprint at the scene of the crime.
The detective used the fingerprint to catch the bad guy.