
JavaScript is a versatile programming language primarily used for web development. Created in 1995 by Brendan Eich, it enables interactivity and dynamic behavior on websites by manipulating the DOM (Document Object Model), handling user events, and communicating with servers via asynchronous requests (AJAX). JavaScript runs on the client side in browsers and on the server side with environments like Node.js. Its lightweight, C-inspired syntax and flexibility make it a cornerstone of modern development, powering frameworks like React, Next.js, and Vue.js. In 2025, it remains the most popular programming language, often paired with TypeScript for more robust projects.