This document summarizes key concepts from three chapters on phonology. It discusses the smallest units of sound called features, as well as segments, syllables, and suprasegmental units. Minimal pairs, phones versus phonemes, allophones, and complementary distribution are explained. Rules of syllable structure and phonotactics are covered. The relationship between phonemic and phonetic representations is summarized. The document also briefly discusses two opposing views on the role of phonological awareness in reading and implications for language learning.