鎖具(ju)是(shi)(shi)指起封閉作用(yong)(yong)(yong)的(de)器(qi)具(ju),它包括鎖、鑰(yao)匙及其(qi)附件,一般(ban)解釋為(wei)“必須用(yong)(yong)(yong)鑰(yao)匙方能開脫的(de)封緘器(qi)”,現在,鎖具(ju)除用(yong)(yong)(yong)鑰(yao)匙開啟(qi)外,還可(ke)以(yi)用(yong)(yong)(yong)光、電、磁、聲(sheng)及指紋等(deng)指令(ling)開啟(qi)。鎖具(ju)不(bu)單是(shi)(shi)防護用(yong)(yong)(yong)品,還具(ju)有(you)“管(guan)理(li)”和“裝(zhuang)飾”的(de)作用(yong)(yong)(yong)。在國際交往中也(ye)有(you)一種禮儀,用(yong)(yong)(yong)贈(zeng)送象(xiang)征性的(de)“鑰(yao)匙”作為(wei)友誼的(de)表(biao)示(shi)。