arc42
arc42 is a template and methodology for documenting and communicating software architecture. It provides a structured approach with 12 sections that cover everything from context and requirements to deployment and cross-cutting concerns. It helps teams create clear, consistent, and comprehensive architecture documentation that is easy to understand and maintain.
Developers should learn arc42 when working on complex software projects that require formal architecture documentation to align stakeholders, onboard new team members, or ensure long-term maintainability. It is particularly useful in enterprise environments, for distributed systems, or when following architecture-centric development practices like Clean Architecture or Domain-Driven Design.