4D animation is a BIM model + time. Time is added to the model to create an animation which conveys the sequencing of a project. By taking the project plan and the BIM model each stage of the project can be animated. 4D animations are used within the industry for
Tenders - To explain how the project will be implemented
Planning - To plan each stage and the sequencing of a project
Visual Communication- Visually communicate the project plan
Review - Review if the project is inline with the timeline
Cost Saving - Saving costs by planning the sequencing & Logistics before going to site
4D aminations can be an animation or a interactive animation where the viewer can control how they view the 4D animation see the section on interactive animations