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C4 Daigram

Understanding Complex Systems with C4 Diagrams

A C4 diagram is a graphical representation of a software system's architecture, structured into four hierarchical levels: Context, Containers, Components, and Code. This model was developed by Simon Brown to provide a clear and concise way to communicate the architecture of complex systems.

Levels of the C4 Model

  1. Context Diagram (Level 1): Shows the system in scope and its interactions with users and other external systems. It provides an overview of how the system fits into its broader environment.
  2. Container Diagram (Level 2): Decomposes the system into interrelated containers such as applications or data stores. It illustrates how these containers interact with each other.
  3. Component Diagram (Level 3): Further decomposes containers into individual components. It details how these components interact within their container or with other containers/systems.
  4. Code Diagram (Level 4): Offers detailed insights into the design elements that can be mapped directly to code. Utilizes notations like UML for representing classes, interfaces, etc..

Purpose of C4 Model

The C4 model facilitates communication among stakeholders by providing different levels of abstraction suitable for various audiences—technical teams can dive deep into component interactions while non-technical stakeholders can understand high-level context diagrams.

This approach helps in collaborative visual architecting and evolutionary architecture, particularly beneficial in agile teams where more formal documentation methods are not desired.

Image placeholder for illustrating C4 model levels.
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