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A thumb drive, also known as a USB flash drive, is a compact and portable data storage device that connects to computers through a Universal Serial Bus (USB) interface. Constructed with flash memory and encased in a small plastic or metal shell, they are commonly used to transfer files between devices, store personal documents, and back up important data. Thumb drives come in various capacities ranging from a few gigabytes to several terabytes, offering users flexibility in terms of storage space and cost. They are popular among computer enthusiasts, professionals, and students alike due to their ease-of-use, durability, and wide compatibility across different operating systems.