Vue is an open-source JavaScript framework for creating user interfaces and single-page applications. It was created by Evan You in 2014 and has quickly become one of the most popular frameworks for web development. Vue allows developers to create dynamic, reactive user interfaces using a component-based structure. It provides a number of features such as data binding, components, routing, state management, and server-side rendering. Vue can be used to develop both large and small applications, making it an ideal choice for any project.