A combination of Diaphragm and Mercury Cell is shown above process to produce Caustic Soda. A concept map is a graphic that depicts the connection between concepts. It is a graphical tool used to organize and organize knowledge by graphic designers, engineers, and architects. Concept maps often display concepts and information as circles or boxes connected by labeled arrows in a downward-branching hierarchical framework. Linking terms such as "causes," "needs," or "contributes to" can be used to express the relationship between topics.