A bobbin is a small, cylindrical object used in sewing and textile manufacturing. It holds thread and is typically placed inside a sewing machine or a hand sewing tool. The thread on the bobbin is essential for creating stitches, as it works in conjunction with the upper thread to form a secure seam. Bobbin types can vary, with some designed for specific machines or purposes. For example, sewing machines often use plastic or metal bobbins, while embroidery machines may require specialized bobbins to accommodate different thread types. Properly winding and inserting a bobbin is crucial for effective sewing.