Nuclear Austronesian refers to a subgroup of the larger Austronesian language family, which is one of the world's most widely distributed language families. This subgroup includes languages spoken in regions such as Southeast Asia and the Pacific Islands, including Tagalog, Cebuano, and Hawaiian. Linguists believe that Nuclear Austronesian languages share a common origin and exhibit similar grammatical structures and vocabulary. The study of these languages helps researchers understand the migration patterns of the Austronesian peoples and their cultural connections across vast oceanic distances.