The basic printed circuit board of a modern electronic computer that provides the housing of the central processing unit (CPU), the electrical connections that allow communication between all the components of the system, and some interfaces for peripherals. 

The sound card is a hardware component that can be integrated into the motherboard or inserted as an external expansion card to be connected via a PCI slot. 

In computer science and electronics, a video card or graphics card is a hardware component of the computer, in the form of an electronic card, which has the purpose of processing the video signal, that is, generating, starting from an electrical signal input from the processor, a specific electrical signal output that can then be sent as input to the video.