This term is frequently using in rendering process. Rendering shows you the final image of your scene with high resolution using its commands. It shows the model structure, texturing, shading and other components of scene.
The model is passed through the rendering process to analysis the model properties. Rendering is actually result of user task which he does on the model. It shows the ability of user work. The rendering requires light for better result therefore there should be proper arrangement of lighting in your scene. Rendering also tells you about how many effect are used in the formation of final result.
Simple Mental Ray
The render is essential in every kind of modeling. The rendering is done into two ways, simple mental ray and I-ray rendering. The mental ray rendering is although used for rendering but it supports only basic scenes of model. It can not show the complex scene clearly; therefore I-ray rendering is used to meet the requirement of complex scene. Mental ray gives you result with slow speed and there is doubt of inaccuracy. While the I-ray performs these job within short period of time and accurate in real time.
The video games are designed under the application of I-ray rendering set up. Suppose you are required to create any model. You will create the basic structure for your model and then assign material to the selected object. Next it is required to assign lighting for better output at rendering time because the render shows the result with more accuracy if there is well arrangement of lighting.
Similarly if you have scene with less resolution then you can adjust it with outstanding lighting assigning. In the video we have also a scene with low level of resolution and we are required to manage the lighting in this scene. So watch the video and learn the concept briefly.