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Game engines use real-time technology to 'render' images, while a rendering engine is the algorithm used to actually render images inside a game engine. Game engine as a whole uses different types of programs to run real-time. For example, physics engine is used to make objects interact with the game world, Loading, displaying, and animating models, collision detection between objects, physics, input, graphical user interfaces, and even portions of a game's artificial intelligence can all be components that make up the game engine. Many new technologies are used to render game assets efficiently such as Normal maps, specular maps etc. which make the low-poly mesh look well polished and detailed.
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