Process concept a process is an instance of a program in execution Batch systems work in terms of jobs". Many modern process concepts are still expressed in terms of jobs, (e. g job scheduling and the two terms are often used interchangeablyProcess Concept • A process is an instance of a program in execution. • Batch systems work in terms of "jobs". Many modern process concepts are still expressed in terms of jobs, ( e.g. job scheduling ), and the two terms are often used interchangeably