"An embedded operating system is an operating system for embedded computer systems. These operating systems are designed to be very compact and efficient, forsaking many functionalities that non-embedded computer operating systems provide and which may not be used by the specialized applications they run. They are frequently also real-time operating systems." (Wikipedia)
PS: Most jön az a rész, hogy elkezdenek bizonyos szavakon lovagolni, és a topic átcsap nyelvészkedésbe. Ezt nem szeretném:(