What is the difference between kellering and hemstitching in machining?

Kellering and hemstitching are both machining techniques used in textile and fabric production, but they serve different purposes. Kellering involves the process of folding and stitching the edge of the fabric to prevent fraying and provide a finished look, often used in garments and home textiles. In contrast, hemstitching refers to a decorative technique that creates an open stitch along the hem or edge of fabric, typically for aesthetic purposes while also securing the fabric layers together.