鎖具(ju)是(shi)指起封閉作(zuo)(zuo)用(yong)(yong)(yong)(yong)的(de)器(qi)具(ju)，它包(bao)括鎖、鑰匙(chi)及(ji)其附件，一般解釋為(wei)“必須用(yong)(yong)(yong)(yong)鑰匙(chi)方能開(kai)(kai)脫的(de)封緘器(qi)”，現(xian)在(zai)，鎖具(ju)除用(yong)(yong)(yong)(yong)鑰匙(chi)開(kai)(kai)啟(qi)(qi)外，還可以(yi)用(yong)(yong)(yong)(yong)光、電、磁、聲及(ji)指紋等指令(ling)開(kai)(kai)啟(qi)(qi)。鎖具(ju)不單是(shi)防(fang)護用(yong)(yong)(yong)(yong)品，還具(ju)有“管理”和“裝飾”的(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)。在(zai)國(guo)際交往中(zhong)也有一種禮儀，用(yong)(yong)(yong)(yong)贈送象征性的(de)“鑰匙(chi)”作(zuo)(zuo)為(wei)友誼的(de)表示。