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A latch is a type of mechanical fastener that is used to join two or more surfaces together while allowing for the regular or eventual separation of the objects or surfaces. A latch typically engages another piece of hardware on the other mounting surface. Depending upon the type and design of the latch, this engaged bit of hardware may be known as a keeper or strike. Note that a latch is not the same as the locking mechanism of a door or window, although often they are found together in the same product.