Why we invent the concept of Process? Why   Process is divided into 5  not 6 or 4 states ? ( 引入进程概念的好处是什么？进程为什么划为5个状态？)

①Process is the basic unit of resource allocation and scheduling and it is the foundation of OS structure. In the process of computer development process is introduced to improve processor utilization and memory utilization.

②A process is an independent function of a program a running activity about a data set. It can