XML, JSON, AJAX

  A. XML

XML (Extensible Markup Language) is a flexible, structured format used for storing and transporting data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. XML allows users to create their own customized tags, making it versatile for representing complex data structures in a wide range of applications, from web services to configuration files.

B. JSON

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. JSON uses a simple syntax of key-value pairs and arrays, making it an ideal format for transmitting data between a server and a web application, as well as for configuration files and data storage in a wide variety of applications.

 C. AJAX

AJAX (Asynchronous JavaScript and XML) is a technique used in web development to create interactive and dynamic web applications. It allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that parts of a web page can be updated without reloading the entire page, enhancing the user experience by making web applications faster and more responsive. AJAX typically involves a combination of JavaScript, XML (or JSON), and HTML.