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# Qt's Modules

Qt 4 consists of several modules, each of which lives in a separate library.

QtCore | Core non-GUI classes used by other modules
QtGui | Graphical user interface components
QtNetwork | Classes for network programming
QtOpenGL | OpenGL support classes
QtSql | Classes for database integration using SQL
QtXml | Classes for handling XML
QtDesigner | Classes for extending Qt Designer
QtAssistant | Support for online help
Qt3Support | Qt 3 compatibility classes

The following extension modules are available in the Qt Commercial Editions on Windows:

QAxContainer | Extension for accessing ActiveX controls
QAxServer | Extension for writing ActiveX servers

If you use qmake to build your projects, the QtCore and QtGui modules are included by default. To link only against QtCore, add the following line to your `.pro` file:

        QT -= gui

See also Qt's Classes.

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