Overlock stitches are a type of stitch used primarily in sewing to finish the edges of fabric. They prevent fraying and unraveling by encasing the raw edges with thread. This technique is commonly used in sergers, specialized sewing machines designed to create overlock stitches quickly and efficiently. These stitches can also provide stretch, making them ideal for knit fabrics. Overlock stitching is often found in ready-to-wear clothing, as it gives garments a professional finish. Additionally, it can be used for decorative purposes, adding texture and visual interest to various sewing projects.