The term Vodou (Vodu or Vudu in Benin and Togo; also Vodon, Vodoun, Voudou, or other phonetically equivalent spellings. In Haiti; Vudu (an Ewe word, also used in the Dominican Republic) is by some individuals applied to the branches of a West African ancestral religious tradition. It is important to note that the word Voodoo is the most common and known usage in American and popular culture, and is viewed as a pejorative by the Afro-Diaspora practicing communities. However, the different spellings of this term can be explained as follows:

The word Voodoo is used to describe the Afro-creole tradition of New Orleans, Vodou is used to describe the Haitian Vodou Tradition, while Vudon and Vodun and Vodoun are used to describe the deities honoured in the Brazilian Jeje (Ewe) nation of Candomble as well as West African Vodoun, and in the African diaspora. Voodoo or Hoodoo also refer to African-American folk spirituality of the Southeastern USA, with roots in West African traditional or "folk" spirituality. When the word Vodou/Vodoun is capitalized, it denotes the Religion proper. When the word is used in small caps, it denotes folk spirituality, or the actual deities honored in each respective tradition.

Its roots are varied and include the Fon, Mina, Kabye, Ewe, and Yoruba peoples of West Africa, from western Nigeria to eastern Ghana. In Benin, Vodun is the national religion, followed by around 80 percent of the population, or some 4.5 million people. The word Vodún (Vodoun Vudu) is the Fon-Ewe word for spirit. Vodou in Haiti is highly influenced by Central African traditions. The Kongo rites, also known in the north of Haiti as Lemba (originally practiced among the Bakongo) and is as widespread as the West African elements. The Vodoun religion was suppressed during slavery and Reconstruction in the United States, but maintained most of its West African elements.