In
phonetics, voice or voicing is one of the three major parameters used to describe a
sound. It is usually treated as a
binary parameter with sounds being described as either voiceless (unvoiced) or voiced, although in fact there can be degrees of voicing (see below).A voiced sound is one in which the
vocal cords vibrate, and a voiceless sound is one in which they do not. Voicing is the difference between pairs of sounds such as and in English. If one places the fingers on the voice box (ie the location of the
Adam's apple in the upper throat), one can feel a
vibration when one pronounces zzzz, but not when one pronounces ssss. (For a more detailed, technical explanation, see
phonation.)
See more at Wikipedia.org...