Microprocessors are similar to the human mind in that they take input from external devices, process the information, and provide output to other devices. A microprocessor is the central processing unit of a microcomputer system and works with input devices, output devices, and memory. An example of a microprocessor system is a temperature control that takes temperature sensor input, processes it, and outputs signals to control a heater or fan. Microprocessors are used in reprogrammable systems like general-purpose computers and embedded systems like photocopy machines.