QML is a multi-paradigm language for creating highly dynamic applications. With QML, application building blocks such as UI components are declared and various properties set to define the application behavior. Application behavior can be further scripted through JavaScript, which is a subset of the language. In addition, QML heavily uses Qt, which allows types and other Qt features to be accessible directly from QML applications.

This reference guide describes the features of the QML language. Many of the QML types in the guide originate from the Qt QML or Qt Quick modules.