To make a computer system convenient to use in an efficient manner
To hide the details of the hardware resources from the users
To provide users a convenient interface to use the computer system
To act as an intermediary between the hardware and its users and making it easier for the users to access and use other resources
To manage the resources of a computer system
To keep track of who is using which resource, granting resource requests, according for resource using and mediating conflicting requests from different programs and users
To provide efficient and fair sharing of resources among users and programs
