Accelerated Graphics Ports (AGP) is a high speed point-to-point channel for attaching a video card to a computer's motherboard, usually just to assist with 3D computer graphics. It was intended to be designed as a successor to PCI type connections.
Why was it being favored over PCI?
Computers are always being more and more graphically oriented. Successive generations of graphic adapters began to push the limits of PCI by having a bus with shared bandwidth. This led to even more developing with the AGP.
For the most part, it is favored more as AGP gives a more dedicated pathway between the slot and the processor rather than sharing the PCI bus. AGP also uses sideband addressing. This means that the address and the data buses are separated so the packet doesn't need to read the information.
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