Phonology is the study of sound systems in languages. It has four branches: segmental phonology which analyzes speech into discrete segments like phonemes; suprasegmental phonology which analyzes features over multiple segments like intonation and stress; diachronic phonology which studies sound patterns through a language's history; and synchronic phonology which studies sound patterns regardless of historical change. Phonology also examines phones which are minimal speech units, phonemes which are distinctive minimal units, and allophones which are variants of phonemes that occur in different phonetic environments. A syllable contains a sonority peak like a vowel with optional onset and coda consonants. Syllable structure and distinctive features are also