Operating system explained\n\n Windows 10 is great for gaming, but if your game doesn't need to be on a Windows platform, you're free to choose another one. It's important to remember that you're likely to use this computer, including the OS, for other everyday tasks, so take that into consideration when you choose an OS.

They also create an easy way for parts of the computer such as the processor and graphics card to interact with each other. Mostly via driver software. This sort of interaction is crucial for a game to actually run. Without an actual OS system, your ability to run a game would be & well, very difficult.