A snap fastener is a type of fastening device commonly used in clothing, accessories, and various fabric items. It consists of two interlocking parts: a male stud and a female socket. When pressed together, they create a secure closure that is easy to open and close, making them popular in garments like jackets, shirts, and baby clothes. Snap fasteners come in various sizes and materials, including metal and plastic, allowing for versatility in design and application. They are often preferred for their durability and ease of use compared to other fasteners like buttons or zippers, enhancing both functionality and style in products.