The motherboard, often referred to as the mainboard or system board, is the fundamental component of a computer. It is a printed circuit board that holds the central processing unit, the memory, and often the sound, video and network cards among other components. The late 1990s found the expansion of the motherboard to its current capabilities. Prior to this, individual circuit boards for each function were connected to a backplane, a set of interconnected sockets. Though the green-surfaced board is relatively newer than many other nostalgic artifacts, it is rapidly becoming an icon of early technology as smaller circuitry is developed.