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Data Model Reference

MongoDB stores all data in documents, which are JSON-style data structures composed of field-and-value pairs.
Database References
Discusses manual references and DBRefs, which MongoDB can use to represent relationships between documents.
GridFS Reference
Convention for storing large files in a MongoDB Database.
A 12-byte BSON type that MongoDB uses as the default value for its documents’ _id field if the _id field is not specified.
BSON Types
Outlines the unique BSON types used by MongoDB. See for the complete BSON specification.