鎖具(ju)是(shi)指起封閉作(zuo)用(yong)(yong)(yong)(yong)(yong)的(de)(de)器(qi)具(ju)，它包括鎖、鑰匙及(ji)其附件(jian)，一般解釋為(wei)“必(bi)須用(yong)(yong)(yong)(yong)(yong)鑰匙方(fang)能開(kai)脫的(de)(de)封緘器(qi)”，現在，鎖具(ju)除(chu)用(yong)(yong)(yong)(yong)(yong)鑰匙開(kai)啟外，還可以用(yong)(yong)(yong)(yong)(yong)光、電、磁、聲(sheng)及(ji)指紋等指令開(kai)啟。鎖具(ju)不單是(shi)防護用(yong)(yong)(yong)(yong)(yong)品，還具(ju)有“管理”和“裝飾”的(de)(de)作(zuo)用(yong)(yong)(yong)(yong)(yong)。在國(guo)際交往中(zhong)也有一種禮儀，用(yong)(yong)(yong)(yong)(yong)贈(zeng)送象征性的(de)(de)“鑰匙”作(zuo)為(wei)友誼的(de)(de)表示。