The three most common methods are steam bending, kerf cuts and laminating.
Steam bending is the easiest method for mild curves such as the top of a seat back.
Kerf cutting is the weakest and not really any use for a seat. It involves cutting deep grooves close together on the back of a piece then bending it and gluing to a form of some sort.
Laminating is sort of like making your own plywood. You cut thin strips and glue them together on a form, then remove from the form once the glue dries. Unlike plywood however, the plies in a lamination usually all run in the same direction.
Hope that helps.
the little guy
I would like to steam bend it. Any advice on how to go about doing that.