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In order to describe the operation of control processes, the data structure in the system that stores the management and control information of processes is called a process control block (PCB Process Control Block). It is a part of the process entity and the most important recording data structure in the operating system.

. It is the most important data structure for process management and control, with each process having a PCB. When creating a process, the PCB is established and runs throughout the entire process until the process is revoked.