Hook and loop fastener is the common term for what many people know as "Velcro."

A hook and loop fastener is a type of fastening system that consists of two components:
A "hook" side: covered with tiny, stiff hooks.
A "loop" side: covered with softer, flexible loops.
When the two sides are pressed together, the hooks interlock with the loops, creating a strong, temporary bond.
Hook and loop fastener can be easily separated by peeling the two sides apart.

Hook and loop fastener Applications are Clothing and footwear , Medical devices , Industrial applications , Home and office organization , Space exploration.