Today, October 24th, is International Programmer's Day, a holiday recognized by many tech companies and software businesses globally. The origin of this festival is 1024, or 256, because it's 2 to the power of 8, and computers store data in binary, thus becoming Programmer's Day.

Neither threads nor processes can be opened indefinitely; they will always consume and occupy resources. Hardware has limited capacity. While ensuring high-efficiency work, hardware resource utilization should also be guaranteed. Therefore, an upper limit needs to be set for hardware to alleviate its pressure, which led to the concept of pools.