A knee protector is a device used to protect the knee from injury or to provide support and stability. It can come in the form of a PAD or a BRACE. A PAD is a cushion-like material that is placed around the knee to absorb shock and provide comfort. A BRACE is a more rigid device that is designed to provide support and stability to the knee joint. Both pads and braces are commonly used by athletes, people with knee injuries, and those with arthritis.