Stands for Advanced Audio Coder, is a standardized, lossy compression and encoding scheme for digital audio. Designed to be the successor of the MP3 format it has better sound quality and smaller size than MP3. Many mobile devices support AAC format like SonyEricsson's W890i, Sony's Walkman, Apple's iPhone, Nokia, Motorola, Samsung, BenQ-Siemens and Philips, BlackBerry, Nintendo's Wii, Creative Zen Portable, Microsoft Zune, (PSP) with firmware 2.0 or greater.
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AC3 file, a Dolby Digital audio file, can be found as the standard audio track on Digital Versatile Discs (DVD) and High Definition Television (HDTV). Dolby Digital ac-3 is the common version containing up to six discrete channels of sound, with five channels for normal-range speakers (20 Hz – 20,000 Hz) (right front, center, left front, right rear and left rear) and one channel (20 Hz – 120 Hz) for the subwoofer driven low-frequency effects like explosion and hammerblow. Batman Returns was the first film to use Dolby Digital technology.
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Audio Interchange File Format (AIFF) is an audio file format standard used for storing sound data for personal computers and other electronic audio devices. (IFF, widely used on Amiga systems), and is most commonly used on Apple Macintosh computer systems.
There is also a compressed variant of AIFF known as AIFF-C or AIFC, with various defined compression codecs.
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(monkey's audio) A file with the extension .ape, is an audio file compressed using Monkey's Audio. Monkey's Audio is a lossless compression, which means it does not permanently discard data during compression. It achieves compression rates of around 40%. Since it is lossless, the quality of the audio after compression will be the exact same.
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Apple Lossless (also known as Apple Lossless Encoder, ALE, or Apple Lossless Audio Codec, ALAC) is an audio codec developed by Apple Inc. for lossless data compression of digital music.

The Au file format is a simple audio file format introduced by Sun Microsystems. The format was common on NeXT systems and on early web pages.

Dolby Digital is the marketing name for a series of lossy audio compression technologies developed by Dolby Laboratories.

Free Lossless Audio Codec (FLAC) is a file format for lossless audio data compression. During compression, FLAC does not lose quality from the audio stream, as lossy compression formats such as MP3, AAC, and Vorbis do.
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Internet radio (also known as web radio, net radio, streaming radio and e-radio) is an audio broadcasting service transmitted via the Internet. Broadcasting on the Internet is usually referred to as webcasting since it is not transmitted broadly through wireless means. Internet radio involves a streaming medium that presents listeners with a continuous "stream" of audio over which they have no control, much like traditional broadcast media; in this respect, it is distinct from "on-demand" file serving.

Lossless Predictive Audio Compression (LPAC) is an improved lossless audio compression algorithm developed.

The audio file format used by Apple in their popular iTunes Music Store often appears on your system with the ".M4A" filename extension. M4A can produce better audio quality than MP3 using less physical space for the files.
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M4P format is "protected AAC". It is a format of purchased music that can be listened to only through the iTunes softer or an iPod.
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".M4R" is one of audio file format for Apple iPhone ringtones.

Matroska Multimedia Container is an open standard free container format, a file format that can hold an unlimited number of video, audio, picture or subtitle tracks inside a single file. It is intended to serve as a universal format for storing common multimedia content, like movies or TV shows. Matroska file types are .MKV for video (with subtitles and audio), .MKA for audio-only files and .MKS for subtitles only. The most common use of .MKV files is to store HD video files.
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Matroska audio.
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MP3 - is an acronym for MPEG-1 (or MPEG-2) Layer 3 audio encoding (it is not an acronym for MPEG-3). MP3 is a popular compression format used for audio files on computers and portable devices.
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Ogg is a free, open standard container format maintained by the Xiph.Org Foundation. The creators of the Ogg format claim that it is unrestricted by software patents and is designed to provide for efficient streaming and manipulation of high quality digital multimedia.

The name 'Ogg' refers to the file format which can multiplex a number of separate independent free and open source codecs for audio, video, text (such as subtitles), and metadata.
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Windows Media Audio (WMA) is an audio data compression technology developed by Microsoft.
Windows Media Audio is one of today's most popular Net audio formats. Though not as popular as MP3, WMA tends to outperform MP3 in the area of sound quality, particularly with files encoded at lower bitrates like 64 or 96 Kbps. This performance advantage makes it handy for applications like portable digital audio players, where total play time is limited by a finite amount of internal memory.
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ntel High Definition Audio (also called HD Audio or "Azalia") refers to the specification released by Intel in 2004 for delivering high-definition audio that is capable of playing back more channels at higher quality than previous integrated audio codecs like AC97. During development it had the codename Azalia.

Microsoft Windows Vista and Windows XP SP3 (see Microsoft Article KB888111) include a Universal Audio Architecture (UAA) class driver which supports audio devices built to the HD Audio specification. Mac OS X has full support with its AppleHDA driver. Linux also supports Intel HDA controllers, as do the FreeBSD, NetBSD and OpenBSD operating systems.
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