What is the DGPU and IGPU

Mainboard: ASUSTeK model: P8P67 v: Rev 1.xx

CPU: Intel Core i5-2500K Sandy Bridge

VGA: NVIDIA GF106 [GeForce GTS 450]

Sorry to ask this Question and maybe it is dummy question but I am confessed to much .

What is the DGPU and IGPU? And How can I found that?

It is belong to CPU or Graphic cards? I read some post but it was not clear for me ?

According this Table my CPU has `HD Graphics 3000`.Now it is IGPU Or DGPU?

Sorry again