AGP Accelerated Graphics Port

The Accelerated Graphics Port (also called Advanced Graphics Port) is a high-speed point-to-point channel for attaching a graphics card to a computer's motherboard, primarily to assist in the acceleration of 3D computer graphics. AGP is a type of computer bus. Some motherboards have been built with multiple independent AGP slots. AGP is slowly being phased out in favor of PCI Express.

Full definition of AGP at Wikipedia

Brown slot on the motherboard dedicated to graphics. Faster than the older PCI bus because it has a direct path to the CPU. You can buy great AGP cards for systems as the newer PCI-Express hardware emerges. But if you're buying a new motherboard and graphics card, go with the PCI-Express.

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