The graphic card hosts the processor in charge of all of the calculations necessary to display an image on your screen. Depending on what you are doing on your PC, one video card might be better suited to your needs than another.
Power and Economy
Video cards integrated into the motherboard are the most power-efficient.
Video Games
Graphics cards evolve very quickly. Integrated video card from AMD and Nvidia will be enough to play casually, but to play the latest video games you might want the additional power a dedicated video card provides.
3D Workstation
Specialized 3D software like Maya or 3D Studio require a specific video card and drivers to make use of the video card processor.
Movies
While any video card that connects to your TV will effectively turn your PC into a home theater PC, a good dedicated video card will provide a better picture and also can provide uncompressed sound for your high-definition equipment.
Office Use
Any video card will work for most home-office use. Only if you want more than two displays will you have to get a higher-end card or add a second video card to your PC.
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