The human hand has many functions. You can grasp, flip pages of a book, manipulate an equipment or even swipe the screen of your smartphone. The hand actually contains 27 different bones and more structures are devoted to controlling the hand than any other body part.
The hand contains 8 wrist bones, 5 mid wrist bones and 14 finger bones. Each finger has three bones, except for the thumb, which has just two bones. The arrangement of these bones help to give a powerful grip and to also handle small objects with good precision.
Ironically, most of the movements in the hand are controlled by muscles that are in the forearm, not in the hand. These muscles are attached to the bones of the fingers by long tendons that pass through the wrist. This arrangement is what makes the fingers move and give them strength, compared to if the muscles were joined to the finger bones directly.