The history of Denim dates back to late 18th century. The name Denim has come from the name of a sturdy fabric which was made in Nimes, France and was called Serge. Since it was made by Andre family it came to be known as Serge de Nimes. When this material was adopted in other countries, its name was shortened to denim.
Denim is actually a rugged cotton twill textile. In this process, the weft passes under two or more warp fibers. This results in diagonal ribbing identifiable also on the reverse of the fabric.
Denim is available in two kinds. One is called Dry or Raw denim. It is not washed after being dyed. It is artificially distressed to have a worn in appearence.
Salvage denim is another kind of denim. In is also raw or unwashed denim which forms a clean natural edge.