A USB (universal serial bus) flash drive is a type of memory device designed to serve as a portable means of backing up important files on your computer. In order to effectively use a USB flash drive, you must know how to open it to access the data. Once you open the flash drive, files and folders can be clicked and dragged to its window. Upon dragging data to the flash drive window, your computer copies files to the device, effectively backing them up to the portable drive. Writer Bio