What is process in OS? How it differ from program?

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Bipin Tiwari · Accepted Answer

A process is basically a program in execution. The execution of a process must progress in a sequential fashion. A process is defined as an entity which represents the basic unit of work to be implemented in the system. Difference between Program and Process : Sr.No. Program Process 1. Program contains a set of instructions designed to complete a specific task. Process is an instance of an executing program. 2. Program is a passive entity as it resides in the secondary memory. Process is a active entity as it is created during execution and loaded into the main memory. 3. Program exists at a single place and continues to exist until it is deleted. Process exists for a limited span of time as it gets terminated after the completion of task. 4. Program is a static entity. Process is a dynamic entity. 5. Program does not have any resource requirement, it only requires memory space for storing the instructions. Process has a high resource requirement, it needs resources like CPU, memory address, I/O during its lifetime. 6. Program does not have any control block. Process has its own control block called Process Control Block. 7. Program has two logical components: code and data. In addition to program data, a process also requires additional information required for the management and execution. 8. Program does not change itself. Many processes may execute a single program. There program code may be the same but program data may be different. these are never same.

What is process in OS? How it differ from program?

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What is process in OS? How it differ from program?

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