A serger is a specialized sewing machine designed to create professional-looking seams and finish edges. It uses multiple threads to stitch and trim fabric simultaneously, which helps prevent fraying and gives garments a clean, polished appearance. Sergers are commonly used in garment construction and can handle various fabrics, making them popular among both hobbyists and professionals. Unlike traditional sewing machines, which typically use one or two threads, a serger can use three or four threads, allowing for more complex stitching options. They are particularly useful for sewing knits and stretchy fabrics, as they provide flexibility and durability in the seams.