JavaScript is one of the most popular programming languages in the world and is used on the majority of websites. It's also used in the development of web, mobile, and desktop applications.
JavaScript allows for the creation of interactive and dynamic websites. It makes it possible to update web pages in real-time, create animations, and create interactive forms. This allows for a better user experience and can make websites more engaging.
With technology evolving and the increasing demand for web and mobile applications, the importance of JavaScript is only going to grow in the future. In recent years, javascript has also been used in other areas, like backend development with node.js, and frontend development with frameworks like React, Vue, Angular.