MAVO is a declarative language and toolset that enables developers to create web applications directly from HTML. It allows users to define data models and actions within HTML attributes, making it easy to create dynamic web applications without the need for extensive JavaScript coding. With MAVO, developers can define data bindings, create interactive elements, and implement CRUD (Create, Read, Update, Delete) operations using simple HTML attributes. This approach simplifies web application development and empowers developers to create rich, data-driven applications with minimal effort.