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What is an Operating System?
1.A program that acts as an intermediary between a user of a computer and the computer hardware
2.Operating system goals:
3.Execute user programs and make solving user problems easier
4.Make the computer system convenient to use
5.Use the computer hardware in an efficient manner


Computer System Structure
Computer system can be divided into four components
Hardware – provides basic computing resources
CPU, memory, I/O devices
Operating system
Controls and coordinates use of hardware among various
applications and users
Application programs – define the ways in which the system
resources are used to solve the computing problems of the
users
Word processors, compilers, web browsers, database systems, video games
Users
People, machines, other computers


Operating System Definition
OS is a resource allocator
Manages all resources
Decides between conflicting requests for efficient and fair resource use
OS is a control program
Controls execution of programs to prevent errors and improper use of the computer


Operating System Definition (Cont)
1.No universally accepted definition
2.“Everything a vendor ships when you order an operating system” is good approximation
3.“The one program running at all times on the computer” is the kernel. Everything else is either a system program (ships with the operating
system) or an application program
Operating