Domain-Driven Design (DDD) is a philosophy and approach to software engineering that emphasizes understanding and modeling the business domain in software development. The key goal of DDD is to create a software system that closely aligns with the business needs and requirements of the domain it supports.

DDD is based on the premise that the most important aspect of software development is understanding the domain that the software is intended to model. To achieve this, DDD advocates for close collaboration between domain experts and software developers throughout the development process. This collaboration is intended to ensure that the software accurately reflects the business domain and that it meets the needs of its intended users.

DDD also emphasizes the importance of creating a shared language and understanding between domain experts and software developers. This shared understanding should be reflected in the software’s design and implementation, which should closely model the concepts and relationships that exist within the domain.

To support these goals, DDD provides a set of design patterns and architectural principles that help developers create software systems that are flexible, extensible, and easy to maintain over time. These patterns include concepts like bounded contexts, aggregates, entities, and value objects, which are intended to help developers model the domain in a way that accurately reflects its complexity and structure.

Overall, DDD provides a powerful framework for creating software systems that closely align with the needs and requirements of the business domain they are intended to support. By focusing on understanding and modeling the domain, DDD enables developers to create software that is more effective, more maintainable, and more resilient in the face of changing business needs and requirements.