A device for weaving, containing a means of lifting selected warp yarns above other warp yarns, forming a space called a shed through which the weft yarn is passed.

Looms cannot function unless the warp is under tension, so all looms also contain a means for stretching the warp. There are many different methods of stretching the warp and of forming sheds, ranging from the very simple to the very complex.

The invention of the loom greatly increased the speed at which cloth could be made of spun yarns