鎖(suo)具(ju)(ju)(ju)是指(zhi)起封閉作用(yong)(yong)(yong)的器(qi)(qi)具(ju)(ju)(ju)，它(ta)包括鎖(suo)、鑰(yao)匙(chi)(chi)及其附件，一般解釋(shi)為“必須用(yong)(yong)(yong)鑰(yao)匙(chi)(chi)方(fang)能(neng)開(kai)脫的封緘器(qi)(qi)”，現(xian)在(zai)，鎖(suo)具(ju)(ju)(ju)除用(yong)(yong)(yong)鑰(yao)匙(chi)(chi)開(kai)啟外，還可(ke)以用(yong)(yong)(yong)光、電(dian)、磁、聲及指(zhi)紋(wen)等(deng)指(zhi)令開(kai)啟。鎖(suo)具(ju)(ju)(ju)不單是防護(hu)用(yong)(yong)(yong)品，還具(ju)(ju)(ju)有“管(guan)理”和“裝飾”的作用(yong)(yong)(yong)。在(zai)國際交往中也有一種禮儀，用(yong)(yong)(yong)贈送象征性的“鑰(yao)匙(chi)(chi)”作為友誼的表(biao)示。