What is os (operating system ) ?why does computer need an os ? An Operating System (OS) is a software program that manages computer hardware and provides common services for computer programs. It acts as an interface between the computer hardware and the user, enabling users to interact with the computer and run programs efficiently. The operating system is responsible for managing the computer's resources, such as memory, processing power, input/output devices, and storage. It also provides a platform for software applications to run, enabling programs to access the hardware resources they need without interfering with each other. An operating system is essential for a computer to function because it provides the necessary environment for software applications to run. Without an operating system, applications would have to interact directly with the hardware, which would be complex and time-consuming, and could result in conflicts between different applications. In addition, the...