Folders are work aids used in sewing machines to improve productivity, quality, and reduce operator fatigue. Common types include guides, presser feet, and stitching jigs. Folders are mostly separate devices attached to machines that enable precise folding of fabrics prior to sewing. Specific folders are used for tasks like shoulder and yoke joining, pocket hemming, cuff hemming, pleating, side seam closing, sleeve placket joining, belt loops, inseams, zippers, bottom leg hemming, and riser seams. Folders for different garment components and sewing operations help standardize quality and increase efficiency.