鎖具是指起封(feng)閉作(zuo)用(yong)(yong)(yong)(yong)的(de)器具，它包(bao)括鎖、鑰(yao)(yao)匙(chi)及(ji)(ji)其(qi)附件(jian)，一般解釋為(wei)“必須用(yong)(yong)(yong)(yong)鑰(yao)(yao)匙(chi)方能開(kai)脫的(de)封(feng)緘器”，現(xian)在(zai)，鎖具除(chu)用(yong)(yong)(yong)(yong)鑰(yao)(yao)匙(chi)開(kai)啟(qi)外(wai)，還可(ke)以(yi)用(yong)(yong)(yong)(yong)光、電、磁(ci)、聲(sheng)及(ji)(ji)指紋等指令(ling)開(kai)啟(qi)。鎖具不單(dan)是防護(hu)用(yong)(yong)(yong)(yong)品，還具有(you)“管理”和“裝(zhuang)飾(shi)”的(de)作(zuo)用(yong)(yong)(yong)(yong)。在(zai)國際(ji)交往中也有(you)一種禮(li)儀，用(yong)(yong)(yong)(yong)贈送象征(zheng)性(xing)的(de)“鑰(yao)(yao)匙(chi)”作(zuo)為(wei)友誼的(de)表(biao)示。