JavaScript Object Notation, or JSON, has become a popular data interchange format in web development. It provides a lightweight and easy-to-read structure for representing data. JSON was derived from a subset of the JavaScript programming language and has been widely adopted due to its simplicity and flexibility. As a result, it is commonly used for transferring data between a web server and a client in a web application. JSON's ease of use and human-readable format make it an ideal choice for structuring data. Unlike its predecessor, XML, JSON is much more concise and less verbose, making it more efficient for transmitting data over the network. JSON's key features include its support for various data types, such as strings, numbers, arrays, and objects, as well as its ability to represent complex hierarchical data structures. JSON is also inherently supported in many programming languages, making it a versatile and widely compatible data format. Due to its widespread use, JSON has become an integral part of web development and is often used in conjunction with AJAX to retrieve data from a server asynchronously. Understanding and mastering JSON is crucial for any web developer, as it plays a vital role in modern web applications and APIs. In conclusion, JavaScript Object Notation (JSON) has gained popularity as a lightweight, human-readable, and versatile data interchange format in web development. Its simplicity, efficiency, and wide support across various programming languages have established it as a standard for transmitting data between a web server and a client. As the backbone of modern web applications and APIs, JSON continues to play a crucial role in shaping the landscape of data interchange on the web.