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# Qt's Namespaces

This is a list of the main namespaces in Qt. For a list of classes in Qt, see Qt's Classes.

Phonon::BackendCapabilities | Contains functions to describe the capabilities of the multimedia backend
Phonon | Contains classes and functions for multimedia applications
QDBus | Contains miscellaneous identifiers used throughout the QtDBus library
QGL | Specifies miscellaneous identifiers used in the Qt OpenGL module
QSql | Contains miscellaneous identifiers used throughout the Qt SQL library
QSsl | Declares enums common to all SSL classes in QtNetwork
QTest | Contains all the functions and declarations that are related to the QTestLib tool
Qt | Contains miscellaneous identifiers used throughout the Qt library
QtConcurrent | High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives