Sergers have two loopers, whereas coverstitch machines only have one. A serger machine always includes two cutting knives that trim uneven fabric edges while you stitch, resulting in an even working area, but a coverstitch machine doesn't. Coverstitch machines are generally used to make garment hems seem professional. It serves the dual purpose of concealing a fabric's rough edges while also preserving the fabric's stretchability. Also, If you have access to or possess a serger, it may be incredibly helpful in the hemming procedure. Sergers provide a neatly hemmed edge in just one step, making them faster than most conventional hems.