There are two (main) types of memory - Random Access Memory (RAM) which is used for most things and video or graphics memory. On budget machines the latter may be part of the former - but in that case it's limited. Or it can be on a dedicated video 'card' (which might not be a separate plug-in card at all, it might be on the computer's main board or motherboard). A gaming machine would normally need a separate video card to render 3D graphics quickly enough.

The video card will have a dedicated processor, too - the Graphics Processing Unit (GPU) which is different from the CPU which was the original subject of this thread.