A carabiner is a metal loop with a spring-loaded gate, commonly used in climbing, hiking, and other outdoor activities. It allows for quick and secure connections between ropes, harnesses, and gear. Carabiners come in various shapes and sizes, with different locking mechanisms to enhance safety. They are typically made from aluminum or steel, providing strength and durability. In addition to climbing, carabiners are also useful in camping and rescue operations. They can be used to attach gear to backpacks or to create anchor points. Their versatility makes them an essential tool for outdoor enthusiasts and professionals alike.