AGP is a particular kind of extension port made for graphics devices. It was created in 1996 as a PCI standard substitute. AGP cards can generate graphics quicker than similar PCI graphics cards because the AGP link offers a separate channel for graphics data.

AGP ports are integrated into a computer's chipset, similar to PCI spaces. They resemble PCI ports in terms of form factor, but they are exclusive to graphics devices. AGP 1.0, 2.0, and 3.0 are just a few of the AGP standards that exist; each uses a distinct voltage. AGP devices must therefore match the requirements of the AGP port they are put in.

AGP cards can only be used in desktop PCs because they need an extension port. AGP was widely used for about ten years, but PCI Express, which debuted in 2004, has since supplanted it. Many desktop computers had AGP and PCI Express ports for a while, but ultimately AGP spaces were entirely eliminated. Consequently, the majority of desktop PCs created after 2006 do not have an AGP port.