Flash drives are used for a variety or reasons, but mainly they are for bringing your files with you. They are pretty much a scaled down, portable version of a hard drive for your computer. SO maybe if you need to bring your novel .txt file with you when your on vacation, export the file to the flash drivbe and take it on vacation, then when you have access to a computer, just plug the flash drive into a USB slot on the computer.
Image of a USB slot
32 GB Flash Drive