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# Glossary

backend
  A part of Mopidy providing music library, playlist storage and/or playback capability to the core. Mopidy have a backend for each music store or music service it supports. See 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 tracklist. To use the core module, see Core API.
extension
  A Python package that can extend Mopidy with one or more backends, frontends, or GStreamer elements like mixers. See Extensions for a list of existing extensions and Extension development for how to make a new extension.
frontend
  A part of Mopidy using the core API. Existing frontends include the MPD server, the MPRIS/D-Bus integration, the Last.fm scrobbler, and the HTTP server with JavaScript API. See Frontend API for details.
mixer
  A GStreamer element that controls audio volume.
tracklist
  Mopidy’s name for the play queue or current playlist. The name is inspired by the MPRIS specification.

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