These are devices that are not part of the microprocessor or motherboard but are controlled by it. These are external Floppy drives, printers, external hard disks, and so on and so forth. Most devices nowadays can be connected and used with the latest operating systems without the need for additional drivers. Some though need specific device drivers or program extensions that allows more efficient use of the said product say a printer. Computers that are connected to the internet and running on windows can install drivers straight from either the manufacturer or from the windows website where tons upon tons of Microsoft accredited device drivers are stored.