It is the sound changes produced by the rise and fall of the voice especially when making certain emphasis.
Intonation
This is the emphasis given to certain syllables in a word or to certain words in a phrase or sentence.
Stress
They are longer and have higher pitch
Stressed syllables
This refers to breaks or pauses in speech that indicate words or grammatical units.
Juncture
This is the property of sound with variation in frequency of vibration.
Pitch