Phonetics plays a fundamental role in second language acquisition (SLA), particularly in developing accurate pronunciation, listening comprehension, and overall communicative competence. As learners strive to master a new language, the ability to perceive and produce unfamiliar sounds accurately becomes essential. This article explores how phonetics contributes to SLA, reviewing key theories and empirical studies, and presenting findings from a qualitative analysis of English language learners exposed to targeted phonetic training. The results indicate that explicit instruction in phonetics significantly enhances learners’ pronunciation and auditory discrimination, emphasizing the need for its integration into language teaching curricula. Pedagogical implications and future research directions are also discussed.