鎖具(ju)(ju)是指(zhi)起封閉作用(yong)(yong)(yong)的器具(ju)(ju),它包括鎖、鑰匙(chi)及(ji)其附件,一般解(jie)釋(shi)為“必須(xu)用(yong)(yong)(yong)鑰匙(chi)方能開脫的封緘器”,現在(zai),鎖具(ju)(ju)除(chu)用(yong)(yong)(yong)鑰匙(chi)開啟外,還(huan)可以用(yong)(yong)(yong)光(guang)、電、磁、聲及(ji)指(zhi)紋等指(zhi)令開啟。鎖具(ju)(ju)不單是防護用(yong)(yong)(yong)品,還(huan)具(ju)(ju)有(you)“管理(li)”和(he)“裝飾”的作用(yong)(yong)(yong)。在(zai)國際交(jiao)往(wang)中也(ye)有(you)一種(zhong)禮儀,用(yong)(yong)(yong)贈送(song)象征性的“鑰匙(chi)”作為友誼的表(biao)示。