鎖具是(shi)指(zhi)(zhi)起(qi)封(feng)閉作用(yong)(yong)(yong)的(de)器具,它(ta)包括鎖、鑰(yao)匙(chi)及其附(fu)件,一(yi)般(ban)解(jie)釋為“必(bi)須(xu)用(yong)(yong)(yong)鑰(yao)匙(chi)方(fang)能開(kai)脫的(de)封(feng)緘器”,現在,鎖具除用(yong)(yong)(yong)鑰(yao)匙(chi)開(kai)啟外,還可以用(yong)(yong)(yong)光、電、磁、聲及指(zhi)(zhi)紋(wen)等指(zhi)(zhi)令開(kai)啟。鎖具不單是(shi)防護用(yong)(yong)(yong)品,還具有“管理”和“裝(zhuang)飾”的(de)作用(yong)(yong)(yong)。在國際交往中也有一(yi)種禮儀,用(yong)(yong)(yong)贈(zeng)送(song)象(xiang)征性的(de)“鑰(yao)匙(chi)”作為友誼的(de)表示。