Advanced Graphics Port is a high-speed point-to-point channel for attaching a video graphics card to the motherboard, primarily to accelerate the computer graphics.
Earlier PCI or ISA slots were used for accelerated graphics video cards. As games adapted to better graphics, more realism and more speed there was a need for a slot dedicated to video graphics. AGP slots were designed to be a direct connection between the video circuitry and the PC's memory.
AGP slots are easily recognizable because they are usually brown, shorter than the PCI slots and located right next to the PCI slots on the motherboard. Basically, AGP runs at twice the speed of a memory bus.
