Which BSON type is used for storing non-hexadecimal binary data?

The BSON type used for storing non-hexadecimal binary data is Binary. This type is specifically designed to hold raw binary data, which can include any arbitrary bytes that do not conform to a specific encoding or format, such as images or audio files. The Binary type allows for efficient storage and retrieval of this kind of data, ensuring that the data is managed without being misinterpreted as text or other BSON types.

In contrast, ObjectId is primarily used as a unique identifier in MongoDB documents and is represented in a specific format that includes both hexadecimal and timestamp information. Array is a BSON type used to store an ordered list of elements regardless of their types, while String is designed for text data, representing sequences of characters and thus is not suited for non-hexadecimal binary data. Each of these types has distinct purposes in BSON, making Binary the appropriate choice for non-hexadecimal binary data storage.