Music Player Daemon (MPD) is a server application that plays audio files. It runs in the background and manages playlists. Clients connect to MPD to control playback, manage the library, and adjust parameters. It uses a client-server architecture. Communication occurs through a text-based network protocol. MPD supports a wide range of audio formats. The music library is organized using an internal database. The system works on multiple operating systems. Configuration is handled through a text file.