What kind of data types can be converted using `JSON.stringify()`?

The JSON.stringify() method is specifically designed to convert JavaScript objects and arrays into a JSON string. When you pass an object or an array to this method, it serializes the data structure into a string format that adheres to the JSON (JavaScript Object Notation) specification, which can then be transmitted or stored. This serialization process allows you to take complex data types, such as nested objects or arrays, and convert them into a unified string representation, making it easier to manage and transfer data.

While it is true that primitive data types such as strings, numbers, and booleans can also be passed into JSON.stringify(), the primary use and capability of the function is to handle objects and arrays effectively. Primitive types will be converted into their string representation but do not benefit from the structured format that objects and arrays provide.

This focus on objects and arrays is why the statement identifies them as the key data types for this method. They encapsulate the rich data structures that JSON aims to represent, while other data types are less significant in this context.