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 have multiple compartments and zippers, making it easy to organize and access items quickly. They are made from durable materials like nylon, polyester, or leather, and come in various sizes, colors, and designs to suit different needs and styles. Comfortable and practical, backpacks are an essential accessory for everyday use.