A user interface mechanism that controls the visibility of datum planes (levels - reference lines - and grids) in views. When you add grids - levels - and reference lines to a project - they may display in more views than desired. For example - when

Revit is often used for designing buildings and creating 3D models of architectural designs. It allows architects to create detailed building designs, visualize the project in 3D, and produce detailed documentation and construction drawings.
Revit is a contraction of Revise-Instantly.