Back in the early days of the computer if you needed to carry data files with you from one machine to the other you used floppy discs. The floppy gave way to the CD and DVD as a method for moving files form one computer to another and taking data with you on the road. As those methods became a paid for computer users, a new type of storage device emerged — the flash drive.
Today flash drives can be used for all sorts of things form backing up data from your computer to carrying files with you from desk to desk or office to office. The flash drive is growing in capacity, but with the majority of flash drives using USB they aren’t growing in performance much.