Posted (our blog)
Speech is the verbal means of communicating.
How speech sounds are made (e.g., children must learn how to produce the "r" sound in order to say "rabbit" instead of "wabbit").
The rhythm of speech (e.g., hesitations or stuttering can affect fluency).
Use of the vocal folds and breathing to produce sound (e.g., the voice can be abused from overuse or misuse and can lead to hoarseness or loss of voice).