Source: Vensim
https://www.vensim.com/

What is System Dynamics ?

System Dynamics is a computer-aided approach to policy analysis and design.  It applies to dynamic problems arising in complex social, managerial, economic, or ecological systems — literally any dynamic systems characterized by interdependence, mutual interaction, information feedback, and circular causality.

The field developed initially from the work of Jay W. Forrester.  His seminal book Industrial Dynamics (Forrester 1961) is still a significant statement of philosophy and methodology in the field.  Within ten years of its publication, the span of applications grew from corporate and industrial problems to include the management of research and development, urban stagnation and decay, commodity cycles, and the dynamics of growth in a finite world.   It is now applied in economics, public policy, environmental studies, defense, theory-building in social science, and other areas, as well as its home field, management.  The name industrial dynamics no longer does justice to the breadth of the field, so it has become generalized to System Dynamics.    The modern name suggests links to other systems methodologies, but the links are weak and misleading.  System Dynamics emerges out of servomechanisms engineering, not general systems theory or cybernetics (Richardson 1991).

Source: System Dynamics Society
https://www.systemdynamics.org/what-is-sd