C4 model

Abstractions of the C4 model: A software system is made up of one or more containers (web applications, databases, etc), each of which contains one or more components, which in turn are implemented by one or more code elements (classes, interfaces, objects, functions, etc)

The C4 model is a lean graphical notation technique for modeling the architecture of software systems. It is based on a structural decomposition (a hierarchical tree structure) of a system into containers and components and relies on existing modelling techniques such as Unified Modeling Language (UML) or entity–relationship diagrams (ERDs) for the more detailed decomposition of the architectural building blocks.

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