An overlock seam is a type of stitch used in sewing that finishes the edges of fabric to prevent fraying. This technique is commonly employed in garment construction and is often created using an overlock sewing machine. The machine trims the fabric edges while simultaneously stitching them, resulting in a clean and professional finish. Overlock seams are particularly useful for knit fabrics, as they allow for stretch without breaking the thread. This makes them ideal for items like t-shirts and activewear. The versatility and efficiency of overlock seams contribute to their popularity in both home sewing and industrial applications.