Research area ranking is the process of evaluating and comparing different fields of research based on various criteria such as productivity, impact, and relevance. This ranking allows researchers, funding agencies, and institutions to identify the most active and influential areas of research in order to allocate resources more effectively. Rankings can be based on citation counts, publication rates, grant funding, and other quantitative measures to assess the overall impact and importance of a specific research area. This information is valuable for shaping research policies, setting funding priorities, and promoting collaboration among researchers working in related fields.