The Couchbase Eventing service allows for data validation in a schema-less NoSQL database by enabling administrators to control the specifics of validation on documents and resulting actions to take, making it an interesting topic to cover given Couchbase's "schema-less" architecture. Data validation is crucial in ensuring the integrity of information stored in the database, particularly with the proliferation of 5G networks and Mobile/Edge devices that require data governance and management. The Eventing service can run application logic on data mutations after the fact, removing duplication of validation logic across multiple applications and centralizing configuration and maintainability of what is considered 'valid' data. By using this service, developers can achieve asynchronous data validation in 3 easy steps, which can be further modified to include additional features such as validating actual values of fields or sending notifications via cURL to an external service.