Climbing holds are essential features used in rock climbing and bouldering. They come in various shapes and sizes, allowing climbers to grip and pull themselves up vertical surfaces. Common types of holds include crimps, slopers, and jugs, each offering different levels of difficulty and grip. These holds are typically made from materials like resin or polyurethane and are often attached to climbing walls in gyms or outdoor climbing routes. The arrangement and variety of holds can create unique climbing problems, challenging climbers to use their strength, technique, and problem-solving skills to ascend.