Rendering

In 3-D graphic design, rendering is the process of add shading, color and lamination to a 2-D or 3-D wireframe in order to create life-like images on a screen. Rendering may be done ahead of time (pre-rendering) or it can be done in on-the-fly in real time. Real-time rendering is often used for 3-D video games, which require a high level of interactivity with the player. Pre-rendering, which is CPU-intensive but can be used to create more realistic images,  is typically used for movie creation.

Source : http://whatis.techtarget.com/definition/rendering