3D rendering is the process of creating images or animation from virtual scenes. These scenes are filled with 3D models, virtual lights and cameras. Via 3D rendering, realistic looking images can be produced, as real world parameters are considered in the process. CGI animation and images are possible through 3D rendering. One rendered frame can take minutes to compute, very sophisticated images can take hours to days to finish.
Image editing skills are essential to achieve good results. Good texturing is an art in itself, also post processing of the render images can add a lot to the final look.
There are many possible uses for CGI. Entire commercials and short films can be created, not to mention the big blockbuster movies.
Please also have a look at the "SERVICES" for 3D rendering, creation of models, artwork and animation.