Explain the CQRS (Command Query Responsibility Segregation) Pattern.

CQRS is an architectural pattern that separates the read and update operations for a data store.

In traditional CRUD, the same data model is used for reading and writing. CQRS splits this: Commands change state (writes) and Queries retrieve data (reads). This allows independent scaling, optimized read/write databases, and distinct security models for reads vs writes.