Sumba has a unique culture and their social life. Sumbanese are traditionally divided into three level of social life : (Raja/King) - Maramba,  Customary Official - Kabihu, and Slaves - Ata. Sumbanese are living from farming, cattle breeding, rice-field farming and trading. Ones owns cattle will contribute to their social status such as if they had more cattle giving them a higher social status. 

Most Sumbanese are Christian (Catholic and Protestant), however, and part of them are still strongly keep their native and original religion called Marapu. Most cultural objects are related to the Marapu religion such as the shape of traditional houses, ceremonies, or kings' graves and tombs