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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 WMA extension is a proprietary audio file compressed using Windows Media Compression. It is a proprietary format developed by Microsoft. This file is both an audio codec and an audio format. This file format was created by Windows to compete with other popular compressed audio formats. We must pay tribute to Microsoft: using their virtually unlimited resources, they have achieved the implementation of support for their brainchild in almost all hardware and software players. Microsoft has implemented support for DRM in WMA, a digital copyright management system that allows you to sell protected songs using special services. There are many WMA sub-formats, including WMA Pro, a lossy codec that supports high-resolution audio; WMA Lossless, a lossless codec that compresses audio without losing quality; and WMA Voice, a lossy codec designed for applications that support voice playback.