BSON, or binary JSON, is MongoDB’s document format. A BSON document stores key-value pairs and resembles both a JSON object and a Python dictionary. section 23.7
A BSON document through PyMongo
A Python dictionary such as {"name": "Jane", "age": 34, "interests": ["Python", "databases", "statistics"]} can be inserted into a MongoDB collection. Retrieval adds an _id ObjectId; queries, updates, replacement, and deletion operate on the stored document.

