A backpack is a versatile and practical bag designed to be carried on the back using two shoulder straps. It is commonly used by students, travelers, hikers, and commuters to carry books, clothes, gadgets, or other essentials. Most backpacks have multiple compartments and zippers for easy organization and access. They come in various sizes, colors, and materials, ranging from lightweight fabric to durable, waterproof designs. Backpacks provide comfort and convenience, allowing users to keep their hands free while carrying their belongings securely.