What are voice, speech, and language?
Voice, speech, and language are the tools we use to communicate with each other.
Voice is the sound we make as air from our lungs is pushed between vocal folds in our larynx, causing them to vibrate.
Speech is talking, which is one way to express language. It involves the precisely coordinated muscle actions of the tongue, lips, jaw, and vocal tract to produce the recognizable sounds that make up language.
Language is a set of shared rules that allow people to express their ideas in a meaningful way. Language may be expressed verbally or by writing, signing, or making other gestures, such as eye blinking or mouth movements.
Child Development 