Pixels make images on monitor which are in form of small dots. It requires a million pixels to create a single image. To translate a million dots to form an image it requires a translator which in common language can be said binary data to image data. This translation happens in Graphic Card mounted in the motherboard. Graphic card for PC can also be denoted as Video card.

Same as motherboard, graphic card also has a processor and RAM, It also has BIOS chip, which is Input/output chip. The chip has memory and the whole setup acts as a processing unit called Graphics processing Unit which contains BIOS chip, memory and input/output startup. It is similar to a computer's CPU. A GPU is designed for performing all the complex calculations that are necessary for graphics rendering. GPU heats up a lot, so it is located under a heat sink or a fan. 

There are two types of GPU or Graphic Card. One is the IGPU (Integrated Graphics Processing Unit): Buy Graphic Card online which is present in the CPU from company and some comes with an integrated version. The combination of CPU and GPU is called Advanced Processing Unit. The IGPU are usually used in low functional laptops or PCs, as they cannot perform higher task or higher resolution images translation. The second is the Dedicated/Discrete GPU/Graphics Card: These are more complex and higher version than IGPU, as the components are more efficient and powerful. These highly complex cards can be combined with any system. Even if the laptops/Pcs are not integrated with graphic cards. Highly efficient, they are used in heavy task like gaming and editing.. Graphics cards for sale and get the best graphics card at a reasonable rate.