(Render) Passes can be used to split rendered images into colors, direct and indirect light to edit them individually, and also to extract data such as depth or normals. Use this tag for questions concerning the use of render passes.
The manual used to use the phrase Render Passes but no simply uses Passes. Passes are described thusly:
(Render) Passes can be used to split rendered images into colors, direct and indirect light to edit them individually, and also to extract data such as depth or normals.
Each render engine has different pass behavior, described in more detail in the cited manual section.
Use this tag for questions concerning the use of render passes