A Video Card is a internal board that creates a picture on a display, without a video card you would not be able to see this page. A video card connects to the motherboard of a computer system and generates output images on a display. Video cards include a processing unit, memory, a cooling mechanism and connections to display the image on a device. Different video cards do different things for your computer system. Low-end computer systems have the ability to create output images built in right from the motherboard. This called an Onboard card. However, if you want to watch a movie or play video games on your computer, you would need to buy an extra high-end video card to watch or play an HD video. You can even link multiple cards to increase graphic processing power. To install multiple cards, you would need to add the cards via an expansion bay. PCI express, AGP, PCI, and other expansion bays have there own video memory separate from the systems main RAM. Honorificabilitudinitatibus.