It stands for Accelerated Graphics Port. If you are trying to find it on your motherboard it will usually be the slot closest to the CPU and off center compared to the PCI slots. There is only one and it is brown. The PCI slots are kinda white and there will be anywhere from 2 to 6 of them. If you need more, tell us the motherboard name and model and we can help you further with locating it or adjusting it in the BIOS.