PREVIS, PITCHVIS, POSTVIS
PREVIS or PREVISUALIZATION is a tool to quickly test and plan the shoot. An animated 3d version of traditional storyboards.
PITCHVIS is a 'spiced up' version of the PREVIS, with added details suitable to pitch the project.
POSTVIS can quickly integrate elements (creatures, mattepaintings, VFX etc) in the shot, to give an idea of the final scene before handoff to final animation.