.. glossary:: backend A part of Mopidy providing music library, playlist storage and/or playback capability to the :term:`core`. Mopidy has a backend for each music store or music service it supports. See :ref:`backend-api` for details. core The part of Mopidy that makes multiple frontends capable of using multiple backends. The core module is also the owner of the :term:`tracklist`. To use the core module, see :ref:`core-api`. extension A Python package that can extend Mopidy with one or more :term:`backends <backend>`, :term:`frontends <frontend>`, :term:`mixers <mixer>`, or web clients. See the `extension registry <https://mopidy.com/ext/>`_ for available Mopidy extensions. See :ref:`extensiondev` for how to make a new extension. frontend A part of Mopidy *using* the :term:`core` API. Existing frontends include the MPD server, the MPRIS/D-Bus integration, the Last.fm scrobbler, and the :ref:`HTTP server <ext-http>`. See :ref:`frontend-api` for details. mixer A part of Mopidy that controls audio volume and muting. tracklist Mopidy's name for the play queue or current playlist. The name is inspired by the MPRIS specification.