Vue is a progressive JavaScript framework used for building user interfaces and single-page applications. It allows developers to create interactive web applications by providing a simple and flexible structure. Vue focuses on the view layer, making it easy to integrate with other libraries or existing projects. One of the key features of Vue is its reactive data binding, which automatically updates the user interface when the underlying data changes. This makes it easier to manage the state of an application. Additionally, Vue has a component-based architecture, allowing developers to create reusable components for better organization and maintainability.