Castello is a term that refers to a castle, often used in Italian contexts. Castles are fortified structures built during the Middle Ages, primarily for defense and residence. They typically feature thick walls, towers, and a central courtyard, serving as a stronghold for nobility and their families. In addition to their military function, castelli often served as symbols of power and prestige. Many castles, such as Castello Sforzesco in Milan, are now popular tourist attractions, showcasing historical architecture and art. They provide insight into the feudal system and the lifestyle of the aristocracy during their time.