This document discusses phonemes, syllables, and syllabification. It begins by defining a phoneme as the smallest unit of sound in speech. There are 44 phonemes in English, represented by letters or letter combinations. A syllable contains at least one phoneme and can be broken into onset, nucleus, and coda. The nucleus is the core vowel sound. Minimal pairs are word pairs that differ by one phoneme, like "fan" and "van". The document also discusses phonological processes like vowel reduction and features of consonants in the International Phonetic Alphabet.