Knee protectors, also known as pads, are protective gear worn around the knee to reduce the risk of injury. They are typically made of foam or plastic and are designed to absorb impact and provide cushioning. They are commonly used in sports such as football, basketball, and hockey, as well as in activities such as skateboarding and skiing. Knee protectors can also be used for medical purposes, such as providing support for those with arthritis or other joint issues.