The Fedora installation CDs and DVD provide you with an image file, boot.iso, that you can burn to a CD and use to boot a system and start the installation process. Typically, you would do this prior to installing Fedora from a local hard drive or from a location on a network. You can now use the CD produced from the boot.iso image to start installation on a system that uses Unified Extensible Firmware Interface (UEFI). CDs produced from older versions of boot.iso only worked with systems that used Basic Input Output System (BIOS).