Teak wood comes from tectona trees grown in Southeast Asia, primarily Indonesia, Myanmar, and Thailand. Sometimes other woods, such as cumaru, grown in Brazil, are sold as teak for cheaper prices. Don't be fooled.
Teak is one of the world's most durable woods; it is close grained hardwood making it great for carving and long-lasting furniture. The heartwood of tectona trees has a special resin that makes the wood very water-resistant, so outdoor furniture and bathroom furniture is often made with teak. Many boats are also made with teak.