File History is a backup feature in Windows operating systems that automatically saves copies of your files. It helps protect your data by regularly backing up files in your Documents, Pictures, Music, and other folders. You can restore previous versions of files if they are lost or accidentally changed. To use File History, you need an external drive or a network location to store the backups. Once set up, it runs in the background, making it easy to recover important documents without needing to remember to back them up manually.