Definition:
They key points of Kanban, Flow and Cadence are: A Kanban System manages the workflow in a way which allows the Product Backlog, Timeboxed Iterations and Estimations to be eliminated. Flow is about effectively delivering maximum value by focussing on optimising the value stream of larger MMFs.
Further Reading:
Book: kanban Maturity Model by Teodora Bozheva, David J. Anderson