History A computer central processing unit (CPU) is an electronic card within a computer that executes computer programs. In the early days of computers they were all different, making computers unique. As the demand for personal computers grew, CPUs are now mass produced in the factories of certain manufacturers. This not only makes them more easily available but also cheaper to produce. Anything that leads a computer program of specific cars electronic toys for kids, possesses a computer CPU somewhere in it. Function The function of a computer CPU is very simple. When activated, it performs a number of computer programs. These programs are the basic instructions for electronic device that it happens to be. For example, the task of the CPU in a computer is to load and maintain the operating system. In children’s toys, the function of a CPU may make something glow or trigger another electronic device that makes a noise. The Four Steps All computer CPUs generally run the same four programs on. The first step is where the CPU actually calls the next part of the instructions from its memory called the “fetch ” step. Next comes the step called “decrypt “, where are the instructions obtained in the first step divided among the other parts of the CPU. Then comes the step “execute “, in which the directions are actually performed. To go back to the example of a personal computer is the step during which the CPU actually loads the computer’s operating system. The final step is called “writeback “, and simply does where the CPU notes about the results of the other three steps in the physical memory in case such a record should later become necessary.