what is 2D and 3D?

2D is a two dimensional image that has no layers so you can't see the characters front and can only go from one side of the page to the other and as you can see in the picture that there is no intense map detail or any in game roundness there is just flat rectangles and pixels so there is no need to be spending ages on the game you just need to make sure you have a slight resemblance to what it's supposed to look like.

2D is used in old video games such as Mario, sonic and metal slug, it is a simple style of graphics because it doesn't need depth but it does have height and depth and can be run by a piece of low quality hardware.

3D is a third dimensional image that has layers and depth as in call of duty and fallout games you see the alley in front of you and you can see your characters arms and guns as they shooting and reloading the weapon as the gun comes up to the screen you can see the magazine drop and the other can be entered.

Street fighter IV is a game that shows that there is no boundaries between 2D and 3D because this shows the player that you can use both at the same time. when you are playing games like street fighter or mortal kombat you can see that they use 2D to fight one on one till the players life goes down till nearly empty then you can do a super finishing move that changes the screen into 3D and shows the whole detail of the game.