A syllable (Ancient Greek: συλλαβή) is a unit of organization for a sequence of speech sounds. It is typically made up of a syllable nucleus (most often a vowel) with optional initial and final margins (typically, consonants).
Syllables are often considered the phonological "building blocks" of words. They can influence the rhythm of a language, its prosody, its poetic meter, its stress patterns, etc.
A word that consists of a single syllable (like English cat) is called a monosyllable (such a word is monosyllabic), while a word consisting of two syllables (like monkey) is called a disyllable (such a word is disyllabic). A word consisting of three syllables (such as indigent) is called a trisyllable (the adjective form is trisyllabic). A word consisting of more than three syllables (such as intelligence) is called a polysyllable (and could be described as polysyllabic), although this term is often used to describe words of two syllables or more.