Photo realism the holy grail of computer graphics. In games, the goal is to create something that looks real. This is done by drawing realistic things, and making the images look real instead of a cartoon.
This picture was drew in an application such as Adobe Illustrator or Adobe Photoshop and it looks like a real lion and her cub. The game is being rendered in real time and this takes up a lot of processing power although most games actually go for the game play instead of focusing so much on the graphics.
Cel shading:
