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What's a graphics card?
A graphics card is adapter that displays graphical data with colour and detail and appears on the screen, the better the graphics card the more detailed it is and more better it looks, it can also be integrated within the motherboard or as a extension card.
What type of graphics cards are there?
There is PCI, Integrated, AGP and PCI-express, integrated are the least powerful out of the 4, if you want to play the latest games on PC you will need to upgrade the graphics card to a better one so it can take the graphics in the game in a solid fps. PCI-express are the graphics which are more up to date, they can run latest games without any lag. The graphics card can be accelerated at least 16x times.