A JSON file is a text file that stores data in a structured format using key- value pairs and arrays, based on JavaScript Object Notation (JSON) syntax. It is designed to be both human-readable and machine-readable. The data in a JSON file is organized with keys (always strings in double quotes) and their associated values, which can be strings, numbers, objects, arrays, booleans, or null. JSON syntax uses curly braces {} to hold objects and square brackets [] to hold arrays, with data separated by commas

. JSON files have the extension .json and are widely used for data interchange between systems, especially in web applications where data is sent from servers to clients. They are language-independent and supported by many programming languages, making them a universal format for storing and transporting data. Common uses include configuration files, data exchange between web servers and browsers, and storing structured information in applications

. In summary, a JSON file is a lightweight, text-based data format that represents structured data in a way that is easy to read and write for both humans and computers.