I think onboard graphics is software that inbuilt in your mothe board. I do no exactly what about it. You can conselt with any software engineer to clarify your doubts.
Hello Guys my name is Mark.I think that On board graphics are those which included into your mother board.On board graphics is built in your motherboard and shares memory with your ram.The drawback of using on board graphics is that it uses your ram so making less to run your programs.Thanks a lot!!