The operating system consists of hundreds of thousands of lines of program instructions and these are stored on hard disk of the computer. Portions of the operating system are loaded into computer system memory (RAM) when needed. To manage the computer system, users, printers, files and write programs, the operating system is generally provided with a number of utility programs. The utilities are used for
Managing Files and Documents
Development of Programs and Software
Communicating between people and with other computer systems
Managing user requirements for programs, storage space and priority