Ajax
Ajax (Asynchronous JavaScript and XML) is a web development technique that enables web applications to send and retrieve data from a server asynchronously without interfering with the display and behavior of the existing page. It allows for dynamic, interactive user experiences by updating parts of a web page without requiring a full page reload, using technologies like JavaScript, XML, and HTTP requests.
Developers should learn Ajax to build responsive, modern web applications that provide seamless user interactions, such as live search suggestions, form validation, and real-time content updates. It is essential for creating single-page applications (SPAs) and improving performance by reducing server load and bandwidth usage, as only necessary data is exchanged rather than entire pages.