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 conveniently transport books, clothing, electronic devices, and other essentials. Backpacks come in various sizes, styles, and materials, often featuring multiple compartments and pockets for better organization. Some modern designs also include padded sections for laptops, water bottle holders, and ergonomic support for added comfort during long use.