ZBrush uses dynamic levels of resolution to allow sculptors to make global or local changes to their models. ZBrush is used for creating ' high-resolution' models (able to reach 40+ million polygons) for use in movies, games, and animations, by companies ranging from ILM and Weta Digital, to Epic Games and Electronic Arts.
The main difference between ZBrush and more traditional modeling packages is that it is more akin to traditional sculpting. It uses a proprietary ' pixol' technology which stores lighting, color, material, orientation and depth information for the points making up all objects on the screen. Pixologic ZBrush is a digital sculpting tool that combines 3D/ 2.5D modeling, texturing and painting.