鎖具(ju)是指起封閉作(zuo)用(yong)(yong)(yong)的器(qi)具(ju),它包括鎖、鑰(yao)匙及(ji)其附(fu)件,一般解釋為“必須用(yong)(yong)(yong)鑰(yao)匙方能(neng)開(kai)(kai)脫(tuo)的封緘器(qi)”,現在,鎖具(ju)除(chu)用(yong)(yong)(yong)鑰(yao)匙開(kai)(kai)啟(qi)外,還可(ke)以(yi)用(yong)(yong)(yong)光、電(dian)、磁、聲及(ji)指紋等指令開(kai)(kai)啟(qi)。鎖具(ju)不單是防護(hu)用(yong)(yong)(yong)品,還具(ju)有“管理(li)”和“裝飾”的作(zuo)用(yong)(yong)(yong)。在國際交往(wang)中(zhong)也(ye)有一種禮(li)儀,用(yong)(yong)(yong)贈送象征性的“鑰(yao)匙”作(zuo)為友誼(yi)的表示。