The C4 model is a framework for visualizing the architecture of software systems. It provides a set of hierarchical diagrams, namely Context, Container, Component, and Code, that help teams understand and communicate the structure and design of their software. By using these diagrams, teams can ensure that everyone—from developers to stakeholders—has a clear and consistent understanding of how the system is structured and how its components interact.
C4 is particularly useful because it strikes a balance between simplicity and detail, making it easier for teams to maintain and use over time compared to more complex architectural frameworks. Its relevance in the "methods-and-patterns" quadrant reflects its role as a best practice for documenting and designing software architecture. The "adopt" ring indicates that it is a mature and widely accepted approach in the industry, recommended for use in most projects to enhance clarity and communication.