Velcro was a Vulcan invention designed to hold fabrics and other surfaces together utilizing tiny hooks and loops.
Unknown at the time, this invention was introduced to Humans by T'Mir, a Vulcan stranded in Carbon Creek, Pennsylvania. T'Mir sold the invention to Big Creek Manufacturing and Sales Co. to raise funds to send Jack to college. Its real origin seemed to be unknown to Earth at least until the 22nd century. (ENT: "Carbon Creek")