A pull-up bar is a piece of exercise equipment designed for strength training, primarily targeting the upper body. It consists of a horizontal bar that is mounted on a wall, door frame, or free-standing structure. Users grip the bar with their hands and pull their body upward, engaging muscles in the arms, shoulders, and back. Pull-up bars come in various styles, including doorway pull-up bars that fit over a door frame and free-standing pull-up stations that offer additional features like dip bars. They are popular for home workouts due to their versatility and effectiveness in building upper body strength.