These files are shared between multiple examples as a set of common and reusuable components. While they do demonstrate the building of reusable components in QML, they are not official examples themselves. Consequently they do not have entries in the Qt documentation, and are documented only through the code comments within the files. Developers new to QML are strongly encouraged to go through the official examples before delving into this directory. For most application use, see the Qt Quick Components project to find ready-made Components you can use in your own projects. Qt Quick examples do not use them only to avoid external dependencies.