鎖具(ju)是(shi)指起封閉作(zuo)(zuo)用(yong)(yong)(yong)的器具(ju),它(ta)包括鎖、鑰(yao)匙及其附件(jian),一般(ban)解釋(shi)為(wei)“必(bi)須用(yong)(yong)(yong)鑰(yao)匙方能開脫的封緘器”,現在,鎖具(ju)除(chu)用(yong)(yong)(yong)鑰(yao)匙開啟外,還(huan)可以用(yong)(yong)(yong)光(guang)、電、磁、聲及指紋等指令開啟。鎖具(ju)不單是(shi)防(fang)護(hu)用(yong)(yong)(yong)品,還(huan)具(ju)有“管理(li)”和“裝飾”的作(zuo)(zuo)用(yong)(yong)(yong)。在國(guo)際交往中也有一種(zhong)禮儀,用(yong)(yong)(yong)贈送象(xiang)征(zheng)性(xing)的“鑰(yao)匙”作(zuo)(zuo)為(wei)友誼的表示。