Microprocessor
Microprocessors were invented in the 1970s for use in embedded systems.  The majority are still used that way, in such things as mobile phones, cars, military weapons, and home appliances.  Some microprocessors are microcontrollers, so small and inexpensive that they are used to control very simple products like flashlights and greeting cards that play music when opened.  A few especially powerful microprocessors are used in personal computers.