The complex systems community put together this great “Complexity Explainer“:
"Complexity science, also called complex systems science, studies how a large collection of components – locally interacting with each other at small scales – can spontaneously self-organize to exhibit non-trivial global structures and behaviors at larger scales, often without external intervention, central authorities or leaders. The properties of the collection may not be understood or predicted from the full knowledge of its constituents alone. Such a collection is called a complex system and it requires new mathematical frameworks and scientific methodologies for its investigation."
This animated video was prepared to provide a general explanation of the field of Complex Systems Science.
*The content of this page is adapted from the CSCS website*