Domain-Driven Design: Core Concepts, Methods, and Practical Cases

Domain-Driven Design (DDD) is a methodological approach that tackles software complexity by aligning business, system, and organizational structures through modeling.

It distinguishes technical complexity (security, performance, scalability) from business complexity, and proposes using metaphors, layering, abstraction, and refinement to decompose large systems into cohesive, loosely‑coupled sub‑domains.

The article outlines DDD’s core concepts, goals, and key methods such as strategic and tactical modeling, bounded contexts, and a ubiquitous language, and demonstrates them with concrete cases from Tencent Video’s membership and media‑asset systems.

Practical steps include four modeling techniques—metaphor, layering, abstraction, and refinement—followed by case analyses that show how to map domains to models, combine business and technical layers, and select appropriate tools (UML for the “academy” side, simple context maps for the “folk” side).

Finally, the piece emphasizes that DDD is not a silver bullet but a valuable part of an architect’s toolbox for managing complexity in large, evolving systems.