April 29th is National Zipper Day, commemorating the invention and evolution of the zipper, which began with Elias Howe's 1851 patent for a clothing closure. Key developments included Whitcomb Judson's clasp locker and Gideon Sundbäck's 1914 modern zipper, with the term 'zipper' coined by B.F. Goodrich in 1923. Today, YKK is a leading zipper manufacturer, producing millions of miles of zippers annually and offering a wide range of fastener products.