How to Use C4 Diagrams in Systems Architecture

C4 diagrams provide a standardized approach to software architecture diagramming, focusing on different levels of abstraction: Context, Containers, Components, and Code. They enhance communication and align teams by using consistent conventions, avoiding varied interpretations often seen with generic boxes and arrows. Best practices include focusing on high-level diagrams and avoiding micromanagement with detailed Code diagrams. Tools like Mermaid and PlantUML are integrating C4 support, making them more accessible for developers.