what is multiprogramming ?

• what is multiprogramming ?

Multiprogramming is a rudimentary form of parallel processing in which several programs are run at the same time on a uniprocessor.
Since there is only one processor , there can be no true simultaneous execution of different programs.
Instead, the operating system executes part of one program, then part of another, and so on.
To the user it appears that all programs are executing at the same time.

• What are the advantages of multiprogramming?

Multiprogramming makes effifcient use of the CPU by overlapping the demands for the CPU and its I/O devices from various users. It attempts to increase CPU utilization by always having something for the CPU to execute
http://wiki.answers.com/Q/What_are_the_advantages_of_multiprogramming

• What is the advantage of Multiprogramming?

Multiprogramming increases CPU utilization by organizing jobs so that the CPU always has one to execute.
Several jobs are placed in the main memory and the processor is switched from job to job as needed to keep several jobs advancing while keeping the
peripheral devices in use.
Multiprogramming is the first instance where the Operating system must make decisions for the users.
Therefore they are fairly sophisticated.