M4B is an audio filename extension for AAC format, which is developed by Apple Inc. It is mainly used on podcast and audiobook files. Typically, M4B files contain audio and other metadata like images, hyperlinks, and chapter markers. M4B files are DRM copy-protected and can be opened on Apple iTunes and QuickTime Player.
MPEG-2 is a digital video coding format introduced in 1995 and later revised in 2013. It uses lossy video and audio data compressions and is very popular among video hardware, thanks to its low computational complexity. It is also widely used in cable and satellite broadcasting as well as writing DVDs.
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