Blender 3D models often use 1 of 2 ways to render 3D models. That include, textures, 3D vertices and lights that are processed with the algorithm. Cycles render may attempting to be the future which allow to create more realistic 3D models, scenes and animations, but for games Blender Render may still be useful in some cases where performance or style if preferred over the high realism of Cycles. It end up depending on the situation you are using, if is needed read more information on the topic but is a base topic to understand, before start working with 3D models.
The tutorial is just a backwards compatibility between the 2 render engines inside blender.
Cycles Render Vs Blender Render
The basic concept on how blender use algorithm to process render.
Posted by jdc01 on - Basic Textures
