These Qt Core classes deal with shared libraries, (for example, .so and DLL files), and with Qt plugins.
See the How to Create Qt Plugins page for more information.
The <QtPlugin> header file defines macros for defining plugins.
Abstract base class for plugins provinding accessibility information for user interface elements
Abstract base class for plugins
Creates plugin drivers
Abstract base for custom QIconEngine plugins
Defines an interface for writing an image format plugin
Loads shared libraries at runtime
Loads a plugin at run-time
Abstract base for custom QML extension plugins
Abstract base for custom QStyle plugins