HD voice is a technology that delivers at least twice the sound as compared to a typical voice phone call delivered on a landline through the world's analog circuit-switched phone network. "Plain old phone service" or POTS to be hip; Public switched telephone network or PSTN if you're more formal
Real world benefits from HD voice include:
Better comprehension and clarity, especially in long detailed and/or technical discussions
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What is a codec?
The word codec comes from mashing together the functions of compressing (co) and decompressing (dec) analog sound into digital bits for use by computers and networks. There are literally hundreds of audio codecs -- pieces of computer code -- available today and embedded in any device that plays sound, from a simple MP3 player to the hottest smart phones. Some are open source and free while others are proprietary and/or patented, requiring licensing ...
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