All Revit-based products are Parametric Building Information Modeling (BIM) tools. These tools are similar to Computer-Aided Design (CAD) programs but are used to build 3D models as well as 2D drawings. In Revit, you place real-world elements like columns and walls into the model. Once the model is built, you can create model views such as sections and callouts. Views are generated from the 3D physical model; consequently, changes made in one view automatically propagate through all views. This virtually eliminates the need to update multiple drawings and details when you make changes to the model.