Arabic is a language that is rich in complexity and diversity, marked by a unique linguistic phenomenon that distinguishes it from other world languages. This paper explores the intricate nature of style in Arabic, focusing on the interplay between its formal and informal registers. It examines how Arabic encompasses Modern Standard Arabic (MSA) as a formal variety used across the Arab world, alongside diverse vernaculars that are deeply rooted in local cultures. The research highlights how this dual linguistic structure contributes to the richness of Arabic as a medium for expression and communication, while also posing challenges in education, media, and social interaction. By analyzing the historical, cultural, and sociolinguistic dimensions of the Arabic style, this study underscores its idiosyncratic role in shaping identity and preserving cultural heritage. It is concluded that The analysis of social media and educational content revealed a growing prevalence of hybrid Arabic forms, blending MSA and vernaculars. Style of speech is a universal phenomenon, and Arabic is not an exception. However, Arabic differs completely from other languages in the type and nature of vernaculars available to speakers as formal and informal choices. Arabic is idiosyncratic in the fact that it has a vernacular that is not the native language of any person; The style of speech is a universal phenomenon and Arabic language is included. Arabic language unlike other languages in the type and nature of vernaculars as formal and informal choices for the language speakers that as nonnative but are widely used as a formal linguistic medium. The formal dialect is known as Modern Standard Arabic(MSA), as a lingua franca across the Arab world which commonly used in formal contexts.