鎖具(ju)(ju)(ju)是指(zhi)起封(feng)閉作用(yong)(yong)(yong)的(de)(de)器(qi)(qi)具(ju)(ju)(ju),它包(bao)括鎖、鑰(yao)匙(chi)及其附件,一(yi)般解(jie)釋(shi)為“必須用(yong)(yong)(yong)鑰(yao)匙(chi)方能開(kai)脫的(de)(de)封(feng)緘器(qi)(qi)”,現(xian)在,鎖具(ju)(ju)(ju)除用(yong)(yong)(yong)鑰(yao)匙(chi)開(kai)啟外,還(huan)可(ke)以用(yong)(yong)(yong)光、電、磁、聲及指(zhi)紋等指(zhi)令開(kai)啟。鎖具(ju)(ju)(ju)不單是防護用(yong)(yong)(yong)品,還(huan)具(ju)(ju)(ju)有(you)“管理”和(he)“裝飾”的(de)(de)作用(yong)(yong)(yong)。在國(guo)際(ji)交往(wang)中也有(you)一(yi)種禮儀,用(yong)(yong)(yong)贈送象征性(xing)的(de)(de)“鑰(yao)匙(chi)”作為友誼的(de)(de)表示(shi)。