Linguistic competence, a core concept in language acquisition and use, has been the focus of extensive theoretical and empirical research. The concept has evolved to include broader dimensions such as communicative competence and sociolinguistic awareness. This paper explores the theoretical underpinnings of linguistic competence. It highlights the interplay between grammatical rules, lexical knowledge, and contextual appropriateness, providing a framework for understanding how linguistic competence contributes to effective communication and language learning.