The correct answer is 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. An operating system is a program that acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs.Functions of Operating System:Memory ManagementProcessor ManagementDevice ManagementFile ManagementSecurityControl over system performanceJob accountingError detecting aidsCoordination between other software and usersAdditional InformationTypes of Operating System:A multitasking operating system allows users to perform more than one computer task (such as the operation of an application program) at a time. A multi-user operating system is an operating system that allows multiple users to connect and operate a single operating system.The users interact with it through terminals or computers that gave them access to the system through a network or machines such as printers.