Ethnicity refers to shared cultural traditions and ancestry that unite a group of people. An ethnic group is defined by common traits like language, religion, customs, and ancestry. Larger ethnic groups can be divided into smaller subgroups over time through isolation or intermarriage. Southeast Asia is home to many ethnic groups that have been influenced by Indian, Chinese, Islamic, and Western cultures due to the region's history of trade and colonization. The ethnic groups vary across Southeast Asian countries and include distinctions based on language, religion, and region. Gender roles also differ across cultures but generally assign males as active and dominant and females as passive and nurturing. [/SUMMARY]