The C4 Model

Good architecture is more than just good code—it's clear communication. The C4 Model: Visualizing Software Architecture is a practical guide to creating diagrams that help teams understand, build, and talk about software systems more effectively. Developed by Simon Brown and used by thousands of teams worldwide, the C4 model breaks architecture down into four simple levels (context, container, component, and code), making it easier to see the big picture and the details.

Whether you're onboarding a new teammate, presenting to stakeholders, or just trying to make sense of a complex system, this book shows you how to create visuals that actually make an impact. With approachable guidance, real examples, and tips for tailoring diagrams to different audiences, it's a must-have for any developer or architect who wants to make their ideas easier to understand.

Learn how to apply the C4 model from high-level views to low-level details
Create diagrams that support collaboration and clarity across teams
Understand who each diagram is from and when to use it
Go beyond C4 with other useful visual tools like dynamic views and deployment maps
Build better conversations around how your software works and why