JavaScript
JavaScript is a high-level, interpreted programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. It enables interactive web pages by allowing client-side scripting to create dynamic content, control multimedia, animate images, and handle user interactions. Originally developed for web browsers, it has since expanded to server-side development (Node.js), mobile apps, desktop applications, and game development.
Developers should learn JavaScript because it is essential for front-end web development, powering nearly all modern interactive websites and web applications. It is also crucial for full-stack development when used with Node.js, enabling a unified language across client and server. Specific use cases include building single-page applications (SPAs), adding interactivity to websites, creating APIs with Express.js, and developing cross-platform mobile apps with frameworks like React Native.