It provides a way of building custom, highly dynamic graphical user interfaces with fluid transitions and effects, which are becoming more common especially in mobile devices.

[2] Qt Quick includes a declarative scripting language called QML.

Qt Declarative is a runtime interpreter that reads the Qt declarative user interface definition, QML data, and displays the UI that it describes.

The QML syntax allows using JavaScript to provide the logic, and it is often used for this purpose.

It is also the native language of Ubuntu Touch.