Castilians are people from the region of Castile in central Spain. This area is known for its rich history, including the development of the Spanish language and culture. Castilians primarily speak Spanish, which is the official language of Spain. Historically, Castilians played a significant role in the unification of Spain during the late 15th century. They were instrumental in the exploration and colonization of the Americas, contributing to the spread of Spanish culture and influence worldwide. Today, Castilians are recognized for their contributions to Spanish art, literature, and cuisine.