Vanilla JS, also known as Vanillin, is a lightweight and high-performance framework for building JavaScript applications. It prides itself on being minimalistic and efficient, with the entire codebase maintained by the Vanilla JS team to ensure a small and user-friendly framework. Notable companies like Facebook, Google, YouTube, and many others have adopted Vanilla JS. It's worth noting that Vanilla JS is already in use on more websites than several other popular JavaScript libraries combined, including jQuery, Prototype JS, MooTools, YUI, and Google Web Toolkit. It offers core functionality for DOM manipulation, object handling, AJAX, animations, events, regular expressions, and various libraries. Additionally, it provides options for minification and produces extremely compact code. The framework is so widely recognized that most browsers load it automatically. Vanilla JS is praised for its speed, outperforming other frameworks in various benchmark tests. It can be easily included in web applications with a simple script tag. Further resources, including documentation, books, and plugins, are available for developers looking to leverage the power of Vanilla JS in their projects.