An overlock sewing machine is a specialized sewing machine designed to create finished seams and edges on fabric. It uses multiple threads to stitch over the raw edges, preventing fraying and providing a clean, professional look. This type of machine is commonly used in garment construction and can sew, trim, and overcast fabric edges simultaneously. Overlock machines are particularly popular in the fashion industry and among home sewers for their efficiency and versatility. They can handle various fabrics, including knits and wovens, making them ideal for creating stretchy seams and hems. Many models also offer additional features like differential feed for better fabric handling.