A syllable is a <u>part of a word</u> that contains sounds (phonemes) of a word. It usually has a vowel in it. A syllable is also called a 'beat' and teachers often teach children to identify syllables by clapping the 'beats' in words. Another way to describe a syllable is a 'mouthful' of a word.
So, for example, 'book' has one syllable, and 'reading' has two syllables.and hope i helped u to understand it.