A zigzag stitch is a type of sewing stitch that creates a zigzag pattern, rather than a straight line. This stitch is commonly used in sewing machines and is versatile for various fabric types. It helps to prevent fraying on the edges of fabric and can also be used for decorative purposes. In addition to its practical uses, the zigzag stitch is often employed in quilt-making and embroidery. It allows for stretch in seams, making it ideal for knit fabrics. Overall, the zigzag stitch is an essential technique in both garment construction and crafting.