C4 Model
The C4 Model is a lightweight, hierarchical approach to visualizing and documenting software architecture through four levels of abstraction: Context, Containers, Components, and Code. It helps teams create clear, consistent diagrams that communicate system structure to different stakeholders, from non-technical users to developers. The model emphasizes simplicity, using standard notation and avoiding overly complex diagrams.
Developers should learn the C4 Model when working on medium to large-scale systems where clear architectural communication is critical, such as in enterprise applications, microservices, or distributed systems. It is particularly useful during design phases, onboarding new team members, or when documenting legacy codebases, as it reduces ambiguity and aligns technical and business perspectives.