Jeans are a type of pants or trousers made from denim or dungaree cloth. Often the term "jeans" refers to a particular style of trousers, called "blue jeans", which were invented by Jacob W. Davis in partnership with Levi Strauss & Co.Jeans are trousers made from denim. Originally work clothes, they became popular among teens starting in the 1950s. Popular brands include Levi's and Wrangler.