Vue.js is a progressive JavaScript framework for building user interfaces, created by Evan You. Unlike monolithic frameworks, Vue is designed to be incrementally adoptable, focusing on declarative rendering and component composition. With its reactive data binding and virtual DOM, Vue provides a highly performant and lightweight solution for modern web applications. Vue integrates seamlessly with other projects and libraries, making it ideal for single-page applications. Its core library is focused on the view layer, while additional tools, such as Vue Router and Pinia, support routing and state management.