In this PyQt5 video we want to learn about PyQt5 QtQuick & QML, QtQuick is a feature of PyQt5 by using that you can separate your main design from logic. and QtQuick has its own language that is called QML. QML is Qt Markup Language, it is a language similar to JavaScript but it is not JavaScript. So when you want to work with QtQuick you need to create two files in Pycharm IDE, the first one is a QML file and the second one is a Python file.