The computer's master control program ... most all computing devices no matter how small or large use an operating system in some form. THIS DEFINITION IS FOR PERSONAL USE ONLY.

Operating systems define how a computer stores files, switches between different applications, manages memory, keeps itself secure, and interacts with peripherals like printers and cameras.

but a 32-bit operating system will run in a 64-bit computer. See 64-bit computing. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.