Graphics Card

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A graphics card (also known as a video card) is an expansion card that increases the output to the image display.

a grapchics card allows you to see what is going on in the screen.

http://computer.howstuffworks.com/graphics-card.htm
The images you see on your monitor are made of tiny dots called pixels. At most common resolution settings, a screen displays over a million pixels, and the computer has to decide what to do with every one in order to create an image. To do this, it needs a translator — something to take binary data from the CPU and turn it into a picture you can see. Unless a computer has graphics capability built into the motherboard, that translation takes place on the graphics card.