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Digital music stores sell copies of digital audio, for example in MP3 and WAV file formats. Unlike music streaming services, which typically charge a monthly subscription fee to stream digital audio, digital music stores download songs to the customer's hard disk drive of their device.
For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint. First public release date is first of either specification publishing or source releasing, or in the case of closed-specification, closed-source codecs ...
Audiobook and podcast files, which also contain metadata including chapter markers, images, and hyperlinks, can use the extension .m4a, but more commonly use the .m4b extension. The Apple iPhone uses MPEG-4 audio for its ringtones but uses the .m4r extension rather than the .m4a extension.
ALAC supports up to 8 channels of audio at 16, 20, 24 and 32 bit depth with a maximum sample rate of 384 kHz. ALAC data is frequently stored within an MP4 container with the filename extension.m4a. This extension is also used by Apple for lossy AAC audio data in an MP4 container (same container, different audio encoding).
Royalty-free Yes Yes Yes Yes Yes No Yes No No Vorbis: Lossy: 2000-05 Open source [92] Yes Private No No Tricky [δ] No No No No MP2: Lossy: 1991-12 Patent-free [ε] Yes Yes No Yes Yes Yes Yes No No MP1: Lossy: 1991-12 Expired patents Yes Yes No Yes Yes Yes Yes No No QDesign Music 1 and 2 Lossy: 1998 Proprietary: QuickTime [γ] No Yes No No No ...
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The iTunes Store accessed via a mobile phone, showing Pink Floyd's eighth studio album The Dark Side of the Moon (1973). A music download (commonly referred to as a digital download) is the digital transfer of music via the Internet into a device capable of decoding and playing it, such as a personal computer, portable media player, MP3 player or smartphone.