Which data type is not available in MongoDB?

In MongoDB, the commonly used data types include Binary, Timestamp, and ObjectId, each serving specific purposes.

Binary data is used to store data in formats such as images or files, while Timestamp allows for the tracking of time with greater precision than typical date formats. ObjectId is a special type used as a unique identifier for documents within a collection, providing benefits such as ensuring uniqueness across distributed systems.

Float, or more accurately, the term "floating-point number," is not a specific data type offered in MongoDB as a standalone type. Instead, there is a numerical type called "double," which is MongoDB's representation of floating-point numbers. The distinction is important because, while you can certainly store floating-point values in MongoDB, they must be stored as doubles, not as a separate float type. Therefore, this lack of a distinct float type is why it is the incorrect answer.

Understanding these data types helps in effectively structuring and querying data within a MongoDB database, ensuring that the right type is used for the intended operations and minimizing data integrity issues.