A backpack is a versatile and convenient bag designed to be carried on the back using two shoulder straps. It is commonly used by students, travelers, hikers, and professionals to carry books, supplies, clothes, or electronic devices. Most backpacks come with multiple compartments and zippers, making it easy to organize and access items quickly. They are available in various sizes, colors, and materials to suit different needs and styles. The design of a backpack allows for hands-free carrying, making it ideal for everyday use and long journeys.