Vue.js is a progressive JavaScript framework used for building user interfaces. It is designed to be incrementally adoptable. The core library focuses solely on the view layer and is easy to pick up and integrate with other libraries or existing projects. Vue.js builds on standard HTML, CSS, and JavaScript and provides a declarative, component-based programming model that aids in efficiently developing user interfaces of any complexity.
The framework is approachable due to its intuitive API and world-class documentation. It is also efficient thanks to a truly reactive, compiler-optimized rendering system that seldom requires manual optimization. Vue.js is versatile, with a rich ecosystem that scales from a library to a full-fledged framework solution.