Domain

In domain-driven design (DDD), a domain is a sphere of knowledge, influence, or activity that represents a specific area of expertise or concern. The domain is the problem space that the software is being built to address, and it represents the business problem or opportunity that the software is meant to solve.

A domain can be a specific industry, such as healthcare, finance, or e-commerce, or it can be a specific area of concern within an industry, such as inventory management, customer management, or logistics.

In DDD, the goal is to create a domain model that accurately represents the real-world concepts and relationships within the domain, and to use this model as the basis for the design and development of software. This domain model should be a reflection of the business domain, it should be understandable by domain experts, developers, and stakeholders, and it should be the backbone of the software system.

A domain can be defined by the business rules, the business processes, the business entities and their relationships, the business requirements, and the business goals.

The domain is the heart of DDD, it’s the foundation of the software and it’s the starting point of the development process. Understanding the domain is crucial to be able to create a software that is aligned with the business needs, less complex, more maintainable and more adaptable to change.