one of usually five articulated digits at the end of the tetrapod hand

A finger is a type of digit attached to the hand. Our type of fingers are similar to those of other primates.[1][2] They are used for doing things and feeling things.

Female fingers
Illustration of the bones of the hand

Humans have five digits, the bones of which are termed phalanges.[2] The first digit is the thumb, followed by the index finger, middle finger, ring finger, and little finger or 'pinky'. According to different definitions, the thumb can be called a finger, or not. The four fingers have three phalanges each; the thumb has two.