鎖(suo)具(ju)是(shi)指(zhi)起封閉作用(yong)(yong)的(de)器(qi)具(ju),它包(bao)括鎖(suo)、鑰(yao)(yao)匙(chi)及(ji)其(qi)附件,一(yi)般解(jie)釋(shi)為(wei)“必須用(yong)(yong)鑰(yao)(yao)匙(chi)方能(neng)開(kai)脫的(de)封緘(jian)器(qi)”,現(xian)在,鎖(suo)具(ju)除用(yong)(yong)鑰(yao)(yao)匙(chi)開(kai)啟(qi)外,還(huan)可以用(yong)(yong)光、電、磁、聲(sheng)及(ji)指(zhi)紋等(deng)指(zhi)令開(kai)啟(qi)。鎖(suo)具(ju)不(bu)單是(shi)防護用(yong)(yong)品,還(huan)具(ju)有(you)“管理”和“裝飾”的(de)作用(yong)(yong)。在國(guo)際(ji)交往(wang)中也(ye)有(you)一(yi)種禮儀,用(yong)(yong)贈送(song)象征性的(de)“鑰(yao)(yao)匙(chi)”作為(wei)友誼的(de)表(biao)示。