This document defines phonology and phonetics and their roles in language learning. [1] Phonology describes how sounds function and are organized in a language to convey meaning, while phonetics studies the physical properties of speech sounds. [2] The document then provides examples of phonetic transcription and discusses phonological processes in connected speech. [3] Phonological processes refer to how the brain instructs the speech apparatus to pronounce words and segments, and how sounds can change in normal speech flow or over time according to phonological principles.