System software is a type of software that operates basic computer functions and provides a platform for running other application software. There are different types of system software including operating systems, device drivers, and programming software. The most important system software is the operating system, which acts as an interface between users and hardware and manages other programs. Major operating systems include Windows, Macintosh, and Linux. Windows 7 was developed by Microsoft as an improved version of earlier Windows operating systems with enhanced features, speed, and resource usage. As technology has evolved, operating systems and devices have shifted from desktop computers to mobile devices like smartphones and tablets.