Domain Engineering is the process of defining and organizing the knowledge and requirements of a specific area or field, known as a domain. It involves identifying common features, functions, and constraints that can be reused across different applications within that domain, which helps streamline development and improve efficiency. This practice is essential in software development, as it allows teams to create a domain model that serves as a blueprint for building applications. By focusing on the unique aspects of a domain, engineers can ensure that their solutions are tailored to meet specific needs while minimizing redundancy and maximizing consistency.