U disk is a kind of miniature large-capacity mobile storage product that uses USB interface and does not need physical drive. Its main purpose is to store data.

It is mainly composed of a shell and a movement, and is connected with a computer through a USB interface to realize plug and play, which is very simple and convenient to use and has good security.

It is mainly used for personal data storage, computer maintenance, system management and transferring applications to other computers.

The flash drive usually adopts ABS plastic or metal shell, and contains a small printed circuit board inside, which makes the flash drive small enough to be put in a pocket like a key chain ornament or strung on a neck rope.