Vue.js is a progressive JavaScript framework used for building user interfaces and single-page applications (SPAs). Created by Evan You, Vue is known for its simplicity, flexibility, and ease of integration with existing projects. It follows a reactive and component-based architecture, making it an excellent choice for developing dynamic and interactive web applications.

Vue.js offers a declarative and component-driven approach to UI development. It utilizes a Virtual DOM for efficient updates, a reactive data-binding system for seamless state management, and directives like v-if and v-for for dynamic rendering. Additionally, Vue provides a clear separation of concerns through its Single-File Components (SFCs), which encapsulate HTML, CSS, and JavaScript within .vue files.