A leather sewing machine is a powered, mechanical tool used to join materials together via stitches. Stitches are connecting points made between materials by singular strands of fibers or threads. Whereas hand sewing involves carefully making each stitch one by one, machine sewing allows for much faster, automated stitching.
Sewing machines, at a high level, have spools of thread, a sewing surface, a needle, a power source, and a control pedal. The materials to be sewn are guided under the needle, and when the control pedal is pressed, the needle moves up and down, inserting stitches into the material. As this happens, the material is moved through the machine and stitches continuously in a linear fashion. The result is a row of stitching that is clean, consistent, and strong. If a leather crafter is producing a volume of items or looking for a consistent finish to their products, sewing machines are indispensable tools.
Also since they are powered tools, the amount of human effort needed to continually press a needle through thick thread is greatly minimized. What might have taken hours by hand, might take only minutes by machine.