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M4A is a file extension used in compressed MPEG-4 audio files that have a lossy compression algorithm. M4A is pretty much very similar to another popular compressed audio format, but is designed to have better quality in the same or even smaller file size. The M4A format was developed by Apple in 2004 and is based on the QuickTime format. Music available for purchase on iTunes usually uses M4A recordings. Many M4A files are encoded with the Advanced Audio Coding (AAC) lossy codec to reduce file size. Some M4A files may use the Apple Lossless Audio Codec (ALAC) instead. The M4A format provides good compression with high sound quality. Any compatible media player will work to play M4A audio, including Apple iTunes, Windows Media Player, VideoLAN VLC media player, Nullsoft Winamp, Apple QuickTime Player, and others.
The WAV format is designed to work with a digitized audio stream, contains musical compositions, voice recordings and various audio effects. It is the best audio format for processing and storing uncompressed audio data that is similar in quality to CDs. One minute of sound in it weighs about 10 MB. WAV occupies a significant amount of memory space, much more than other popular formats, so very few people use this format to store their own audio library on a computer. The Wave format is needed for the release of a disc, LP, download for sale on sites, and must be with the parameters of 16 bit 44.1 KHz. It is also used in audio editing programs to save time on compressing and decompressing data. The WAV format is only a container file, and the audio content is compressed using a wide variety of codecs.