The document discusses SolidWorks Simulation submodeling. Submodeling allows refining the mesh for a selected portion of a larger model to improve results at critical areas without rerunning the full analysis. Key benefits include transferring loads accurately to local regions, experimenting with different designs locally, and saving computation time by rerunning analysis just on the submodel. An example is given of using submodeling to perform FEA with mesh refinement just on a frame portion.