The ID3-Tag represents a series of digital information inserted into an MP3 music file such as the title, the artist, the year and others.

The ID3-Tag is used on a stereo to give the possibility to show on the display some information related to songs stored on an MP3 file.

The information is entered into the MP3 file and the most common information is: the artist's name, the title of the song, the year and the music genre.