C4 Model Diagraming

The C4 model for visualising software architecture: Context, Containers, Components, and Code

“The C4 model is an easy to learn, developer friendly approach to software architecture diagramming. Good software architecture diagrams assist with communication inside/outside of software development/product teams, efficient onboarding of new staff, architecture reviews/evaluations, risk identification (e.g. risk-storming), threat modelling (e.g. STRIDE/LINDDUN), etc”. - C4 Model