What is a ‘Viewport’ in Revit?

A viewport in Revit is a frame that displays the view of a model on a sheet. It is essential for presenting various views, such as floor plans, sections, elevations, and 3D views, within the context of a printed document or layout. Viewports allow users to manage how these views are organized and displayed on sheets during the documentation and presentation phases of a project. They provide a boundary for the view and allow for precision placement and scaling of the model representation.

In contrast to other options, entering data in schedules pertains to the management of project information rather than visual representation. The creation of three-dimensional views involves different tools within Revit but does not align with the specific function of viewports. Additionally, controlling visibility in the model pertains to visibility settings and filters rather than the presentation aspect of a sheet layout. Therefore, recognizing the primary function of a viewport as a framing tool for views placed on sheets clarifies why this is the correct answer.