Imagine you have a toy hand that can move and grip things just like your own hand. Now, imagine that instead of using your own hand to control the toy hand, you have a special machine that can make the toy hand move on its own. This special machine is called a "shadow hand."
The shadow hand can learn from a human hand and copy its movements. It does this by using special sensors and computers that tell it how to move its fingers and other parts of the hand.
Scientists and engineers use shadow hands to study how the human hand works, to develop better prosthetic limbs for people who have lost their hands, and to create robots that can pick up and manipulate objects.
In simple terms, a shadow hand is a toy hand that can move on its own, and scientists use it to make better robots and prosthetic limbs.