A segregated core is a DDD pattern that involves separating the core domain into smaller, independent parts or modules, each with its own bounded context. This allows for greater flexibility and scalability in the design of complex systems, as well as improved modularity and maintainability. The idea is to avoid having a monolithic, tightly-coupled core domain that can become difficult to change or maintain over time. By separating the core into smaller, focused parts, each with its own context and responsibility, teams can work more efficiently and make changes more easily. The segregated core pattern is often used in conjunction with other DDD patterns, such as bounded contexts and context maps, to create a well-structured and flexible architecture for large-scale systems.