The correct answer is Operating system Key Points Operating system An Operating System (OS) is an interface between a computer user and computer hardware. An operating system is a software that performs all the basic tasks like file management, memory management, process management, handling input and output, and controlling peripheral devices such as disk drives and printers. Operating System (OS) is a type of system software kernel that sits between computer hardware and end-user. It is installed first on a computer to allow devices and applications to be identified and therefore functional. Additional Information Firmware In computing, firmware is a specific class of computer software that provides low-level control for a device's specific hardware. Firmware, such as the BIOS of a personal computer may contain only elementary basic functions of a device and may only provide services to higher-level software. Translator A translator is a programming language processor that converts a computer program from one language to another. It takes a program written in source code and converts it into machine code.