What Is an Operating System? An operating system (OS) is the fundamental software that acts as the brain of your computer. It's the master program that orchestrates all the computer's operations, ...

What is a guest OS (guest operating system)? A guest operating system is the operating system installed on either a virtual machine (VM) or partitioned disk. It is usually different from the host ...

Calling something an operating system can sound like marketing fluff. But in enterprise software, an operating system plays a specific role: It coordinates complexity. A true operating system doesn't ...