Mongoose is an Object Data Mapper (ODM) for MongoDB that provides schema validation, data modeling, and query building on top of the native MongoDB driver. Developers use Mongoose to define structured schemas for their MongoDB collections, enforce data types and validation rules, and simplify common database operations like querying, updating, and deleting documents. It's particularly useful for applications that benefit from schema consistency and want a more organized approach to working with MongoDB data compared to using the driver directly.

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