Achiote is a plant that grows in the tropical areas of South America. It has a red fruit with bright red seeds, and is used as both a colorant and a flavoring for food. Annatto is another name for achiote - it's the name of the colorant obtained from the seeds of the achiote plant.
Achiote paste is a traditional component of Mexican cuisine. Achiote is part of many commercial South American seasoning mixes, such as Goya brand Sazón with culantro and achiote. Achiote is used to season tamales, Ecuadorian llapingachos (potato pancakes), arroz con pollo, and many other South American dishes.