Range of motion (ROM) refers to the extent of movement possible at a joint. It is measured in degrees and can vary between individuals and joints. Factors affecting ROM include age, flexibility, and physical condition. Maintaining a healthy ROM is important for overall mobility and function. There are two main types of range of motion: active and passive. Active ROM is the movement performed by an individual without assistance, while passive ROM involves movement facilitated by an external force, such as a therapist. Regular exercises can help improve and maintain both types of ROM, contributing to better joint health and physical performance.