A knee guard is a protective device designed to support and shield the knee joint during physical activities. It is commonly used in sports like basketball, football, and skateboarding to prevent injuries such as sprains or strains. Knee guards can be made from various materials, including foam, neoprene, or hard plastic, and are available in different styles to suit specific needs. These guards are typically worn over the knee and may feature adjustable straps for a secure fit. Some knee guards also provide compression, which can help reduce swelling and improve blood circulation. Overall, they are essential for athletes and individuals engaging in high-impact activities.