The correct answer is Application software.Application software:An application program is a computer program designed to carry out a specific task other than one relating to the operation of the computer itself, typically to be used by end-users.Examples of an application include a word processor and a media player.The collective noun application software refers to all applications collectively.The other principal classifications of software are system software, relating to the operation of the computer, and utility software ("utilities").Applications may be bundled with the computer and its system software or published separately and may be coded as proprietary, open-source, or projects.Apps built for mobile platforms are called mobile apps. Additional InformationSystem software:System software is a type of computer program that is designed to run a computer's hardware and application programs.The system software is the interface between the hardware and user applications.The operating system is the best-known example of system software.The OS manages all the other programs on a computer.System software is used to manage the computer itself. It runs in the background, maintaining the computer's basic functions so users can run higher-level application software to perform certain tasks.Essentially, system software provides a platform for application software to be run on top of.Operating system software:An operating system is the most important software that runs on a computer.It manages the computer's memory and processes, as well as all of its software and hardware.It also allows you to communicate with the computer without knowing how to speak the computer's language.Without an operating system, a computer is useless.Platform software:A platform is a set of software and a surrounding ecosystem of resources that helps you to grow your business.A platform enables growth through connection: its value comes not only from its own features, but from its ability to connect external tools, teams, data, and processes.A platform can be seen both as a constraint on the software development process, in that different platforms provide different functionality and restrictions; and as an assistant to the development process, in that they provide low-level functionality ready-made.For example, an OS may be a platform that abstracts the underlying differences in hardware and provides a generic command for saving files or accessing the network.