ads are thin, flexible strands, made of polyester. These yarns are composed of multiple fibers interwoven or twisted to provide strength and flexibility.They are used to join fabrics or other materials by sewing. Sewing threads are available in a wide range of colors and thicknesses to suit different types of fabrics and purposes. They are one of the most important elements in clothing making, accessories and other sewing projects. On the other hand, sewing threads can be used by hand or with sewing machines. In the first, they are threaded through a needle and stitch movements are used to attach the layers of fabric. While with the second, the thread is automatically fed through a bobbin and a needle that makes quick movements from top to bottom to create even stitches. In short, sewing threads are strands used to join fabrics and other materials by sewing. They are flexible, durable and available in different colors and thicknesses to suit various sewing applications.