A process is an execution environment composed of text segments, user segments, and system segments.

The difference between a process and an application program is that the application program is stored as a static file in the storage space such as the hard disk of the computer system, while the process is a system resource management entity maintained by the operating system under dynamic conditions.

Other processes in concurrent execution have a mutually restrictive relationship. It is sometimes in a running state, sometimes suspended for some reason, in a waiting state, and when the reason for suspending it disappears, it is ready to run again. So you have to distinguish between these states.