The most commonly used technology for web development is JavaScript. It is a versatile scripting language that allows developers to create dynamic and interactive web applications. JavaScript can manipulate HTML and CSS, enabling responsive design and user interactions on the client side. With frameworks like React, Angular, and Vue.js, development has become more efficient and powerful. JavaScript also plays a significant role in server-side development through environments like Node.js. Its widespread adoption and extensive libraries and frameworks make it a cornerstone technology in modern web development.