A buttonhole is a small opening in fabric designed to hold a button, allowing two pieces of material to be fastened together. Typically found on clothing like shirts, jackets, and pants, buttonholes can be made by sewing or using a special machine. They come in various shapes and sizes, depending on the type of button they accommodate. Buttonholes are often reinforced to prevent fraying and ensure durability. They can be functional or decorative, adding style to garments. The process of creating a buttonhole involves careful measurement and stitching, making it an essential skill in sewing and tailoring.