The graphics card is geared toward the gaming community. All motherboards come with a build in graphics card, so it is not necessary to purchase one separately. However, the built in graphics card is typically a much smaller version than what many games require. Also many games required what is referred to as a dedicated graphics card. What this means is that the game needs a separate graphics card, not the graphics card that is built into a motherboard.
Not comfortable building your own computer just yet? Buy prebuilt computer kits here!