In the whole of Vanuatu and especially outside the capital Port Vila, life is strongly influenced by what they locally refer to as kastom. This amazing word refers to a set of traditional customs and taboos that regulates all aspects of life of the people. Kastom is a pijin word (Bislama/English) used to refer to traditional culture, including religion, economics, art and magic in Melanesia.
The term is the generally accepted term in anthropology to describe such phenomena as well as the common and lay term used in everyday language.
Source: https://en.wikipedia.org/wiki/Kastom, https://constative.com/facts-file/amazing-facts/11-amazing-facts-about-vanuatu