JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language. JSON is often used to send data between a server and a web application. Here's an example of a JSON file: { "name": "John Doe", "age": 30, "city": "New York" } In this example, we have a simple JSON object with three key-value pairs. The keys are strings, and the values can be strings, numbers, arrays, objects, or even boolean values or null. To create a JSON file, you can simply write the data in the correct format and save it with a .json file extension. It is important to note that JSON syntax requires double quotes for keys and strings, and does not support comments. When working with JSON in JavaScript, you can parse a JSON string into an object using the JSON.parse() method, and you can stringify an object into a JSON string using the JSON.stringify() method. JSON is a popular and versatile data structure that is widely used in web development. Understanding how to create and work with JSON files is essential for any developer working with web applications and APIs.