How does a processing device work?

A processing device, such as a CPU (Central Processing Unit), works by executing instructions from computer programs. It retrieves data from memory, processes it according to predefined instructions, and then stores the results back in memory or sends them to output devices. The CPU uses a combination of arithmetic logic units to perform calculations and control units to manage the flow of data. This cycle of fetching, decoding, executing, and storing is repeated continuously to perform complex tasks.