VueJs is an open-source progressive JavaScript framework for building user interfaces (UIs) and single-page applications; it is commonly referred to as Vue. It's lightweight, flexible, and easy to get started with. But it's also a full, rich framework that can grow to meet the needs of the most advanced web app builder.

Vue is a framework, though. On its introduction page, it says: "Unlike other monolithic frameworks, Vue is designed from the ground up to be incrementally adaptable." That means that you can use as little or as much of the power of Vue as you want in your apps.

You can use Vue to manage an image slideshow, or you can build a full single-page app with all the bells and whistles. That includes testing, routing, state management, security, and much more.

The best source to get more information is the official site of VueJS: https://vuejs.org/