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This article mainly introduces what threads, programs, and processes in python mean. It has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

A thread is similar to a process, but a thread is a smaller unit of execution than a process. A process can spawn multiple threads during its execution. Unlike processes, threads of the same type share the same memory space and a set of system resources, so the system is much less burdened than processes when spawning a thread or switching between threads, which is why threads are also called lightweight processes.

A program is a file containing instructions and data that is stored on disk or other data storage device, that is, a program is static code.

A process is an execution process of a program, and is the basic unit of the system running the program, so the process is dynamic. A system runs a program that is a process from creation, operation to extinction. Simply put, a process is an executing program that executes instruction by instruction in the computer, and each process also occupies some system resources such as CPU time, memory space, files, access to input and output devices, and so on. In other words, the program is loaded into memory by the operating system while it is executing. A thread is a process divided into smaller units of execution. The biggest difference between threads and processes is that each process is basically independent, while threads are not necessarily, because threads in the same process are most likely to affect each other. From another perspective, processes belong to the category of operating systems, mainly in the same period of time, more than one program can be executed at the same time, while threads are more than one program segment executed almost simultaneously in the same program.

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