An overlock stitch is a type of stitch used primarily in sewing to finish the edges of fabric. It prevents fraying and provides a clean, professional look to seams. This stitch is commonly created using an overlock sewing machine, which trims the fabric edges while simultaneously stitching them together. Overlock stitches are often used in knit fabrics, as they allow for stretch and flexibility. They can also be found in various types of garments, such as t-shirts and activewear, where durability and comfort are essential. Overall, the overlock stitch is a valuable technique in garment construction.