An operating system is a software program that manages and operates computing devices such as smartphones, tablets, computers, supercomputers, web servers, automobiles, network towers, smartwatches, and other similar devices. It is the operating system that makes it unnecessary to know a coding language in order to interact with computers. It's a graphical user interface (GUI) layer that serves as a bridge between the user and the computer's hardware. Furthermore, the operating system oversees the execution of applications and manages the software side of a computer.