A flash drive, also known as a USB drive or thumb drive, is a portable data storage device that uses flash memory to store files. It connects to devices such as computers, laptops, and tablets via a USB port. Typically compact in size, it is designed for easy transport and can hold a significant amount of data ranging from gigabytes to terabytes. The device is often encased in a durable material, providing protection against physical damage while allowing for quick data transfer. It is commonly used for transferring documents, music, photos, and videos, as well as for creating backups and mobile file storage.