Data migration in MongoDB refers to the process of transferring data from one database to another. This could involve moving data between different MongoDB instances, upgrading to a newer version of MongoDB, or restructuring the database schema.
Data migration is crucial for maintaining database integrity and scalability. It ensures that data remains accessible and usable as the database evolves. Without proper migration processes in place, data may become fragmented, outdated, or inaccessible, leading to issues with data quality and system performance. Therefore, understanding how to perform data migration effectively is essential for developers working with MongoDB.