What is a Program and Process:
In early day computer system were able to run only one program at time. This program was able to access all the system resources. Multiple jobs can load into the computer memory and concurrently executed. So, when the program is in execution, it is called process.
Process means is Education a program is in execution. In modern time sharing system, process is tee unit of work. In the computer system more than one process can execute at a time. These processes send the request to allocate the system resources. All of the information about the process contains by PCB.