鎖(suo)具(ju)(ju)(ju)是指(zhi)起(qi)封(feng)閉(bi)作(zuo)用(yong)(yong)(yong)(yong)的器具(ju)(ju)(ju)，它包括鎖(suo)、鑰(yao)匙及其附件，一般(ban)解(jie)釋為“必須用(yong)(yong)(yong)(yong)鑰(yao)匙方能開脫(tuo)的封(feng)緘(jian)器”，現在，鎖(suo)具(ju)(ju)(ju)除用(yong)(yong)(yong)(yong)鑰(yao)匙開啟外(wai)，還可以用(yong)(yong)(yong)(yong)光、電、磁、聲及指(zhi)紋等指(zhi)令開啟。鎖(suo)具(ju)(ju)(ju)不單是防護用(yong)(yong)(yong)(yong)品，還具(ju)(ju)(ju)有“管理”和“裝飾”的作(zuo)用(yong)(yong)(yong)(yong)。在國際交往中(zhong)也有一種(zhong)禮(li)儀，用(yong)(yong)(yong)(yong)贈送象征(zheng)性的“鑰(yao)匙”作(zuo)為友誼的表示。