Event sourcing is a software design pattern used in web development to capture, store, and replay the events that represent the changes in the state of a system, such as the creation, modification, or deletion of data, and to derive the current state of the system from the sequence of events. Event sourcing can enable various benefits, such as auditability, traceability, or scalability, and can support various use cases, such as event-driven architectures, microservices, or CQRS. Event sourcing can also improve the consistency, availability, and durability of web systems, and can facilitate the implementation of business logic and rules.