Rez (Verified Source)

Testing new software versions without breaking existing pipelines.

Ensuring all artists in a studio are using the exact same version of Maya, Pyblish, and internal tools.

Environments can contain hundreds of packages, yet typically resolve and load in just a few seconds.

It is primarily used in to manage specialized software (e.g., Maya, Houdini, Nuke) and their associated plugins/libraries. 2. Core Concepts

Packages are installed once in a shared location, rather than inside every environment.

Multiple versions of the same software (e.g., Python 2.7 and Python 3.10) can exist simultaneously without conflicting.