Software is a set of instructions that operate the functions of a computer. There are two major types of software used in business - system software and application software. System software includes operating systems like Windows, Linux, and macOS, which manage the activities and control of a computer. Application software are programs designed to help users perform specific tasks, and there are two types: customized software developed for a specific purpose, and general purpose software for broad uses. Major categories of application software include office suites, web browsers, media players, games, graphics editors, and enterprise resource planning (ERP) systems which integrate vital business operations across an organization.