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 interchangeably.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 interchangeably