Domain-Driven Design (DDD) is a software development approach that emphasizes collaboration between technical and domain experts to create a shared understanding of the problem space. It focuses on modeling the core business concepts and processes, ensuring that the software reflects the real-world domain it serves. In DDD, the primary goal is to create a Ubiquitous Language that both developers and stakeholders can use to communicate effectively. This language helps in defining Bounded Contexts, which are distinct areas of the domain that can be developed independently, allowing teams to manage complexity and improve the overall design of the system.