The COMSOL Group provides software solutions for multiphysics modeling. The software tools can be used to model and simulate any physics-based system. COMSOL Multiphysics® includes the COMSOL Desktop® graphical user interface (GUI) and a set of predefined user interfaces with associated modeling tools, referred to as physics interfaces, for modeling common applications. A suite of add-on products expands this multiphysics simulation platform for modeling specific application areas as well as interfacing with third-party software and their capabilities. COMSOL Multiphysics is required to run any of the add-on products.