An AGP is a somewhat old-fashioned way of connecting a graphics card to a computer. Still, many people are interested in AGP, which is why an AGP forum will be worth something when you wish to discuss various AGP topics. Read more about the AGP forum at this site!
Like other types of computer interface, you will need an AGP slot in order for your graphics card to connect to the Motherboard and run the graphics programs. Although AGP was originally designed for 3D graphics, that doesn't mean you have to have two separate types of graphics cards in order to view websites and other types of graphics properly. It's important to know where the AGP slot is in order to properly install necessary hardware.
Your computer should have more than one AGP slot to allow for the installation of several graphics cards. Some people use both PCI and AGP slots for different types of graphics but with modern designs, that is no longer necessary. About ten years ago when AGP was first introduced, many people chose to use both AGP and PCI based upon the speed necessary for the graphics program. Some erroneously believed that a slower graphics card capability assured higher quality resolution, but today we know higher speed resolutions are the key to quality.
How many AGP slots you actually use in your computer depends upon the amount of graphics you use. If you're just viewing graphics from websites and other sources, you will not need as much graphics capabilities as you do if you are creating graphics or running videos. Those who use HTML to create their own graphics will also have an increased need for higher graphics capabilities than those who choose to create web pages from pre-designed graphics.
One of the most important things you can do when you get a new computer is to review its graphics capabilities and determine what types of graphics interface it has. You can then decide whether you need to add more or choose a different interface contingent on what types of things you do with graphics.