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The AGP bus/port/slot was introduced back in '97 and is only intended for video cards unlike the PCI slot which is used for most types of expansion cards. AGP isn't available on every motherboard (aka mainboard) because some manufacturers save money (and space) by integrating the graphics chip directly on the motherboard. Most of the time those boards are missing the AGP slot, but sometimes it's still there. If so you can just pop in a new (AGP) video card and start blazing away. If not, you are left with the PCI alternative (or stick with the integrated graphics).
Before the PCI slot was introduced expansion cards used a slot called ISA (or E-ISA). This was a slow solution but worked alright back then. In the name of backwards compability this slot remained on lots of motherboards for ages, but is finally disappearing now. No video card using the ISA port could handle running the Aquarium.
I'm enclosing an image which might clarify what the slots look like inside the PC. Since there probably are some expansion cards in the slots your PC will not look exactly like in the image, but you should get the picture...
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