鎖具是指(zhi)起封閉作用(yong)(yong)(yong)的(de)器具，它(ta)包(bao)括鎖、鑰匙(chi)及其附(fu)件(jian)，一般(ban)解釋為(wei)“必須用(yong)(yong)(yong)鑰匙(chi)方能開(kai)脫的(de)封緘器”，現在，鎖具除用(yong)(yong)(yong)鑰匙(chi)開(kai)啟外，還可以用(yong)(yong)(yong)光(guang)、電、磁(ci)、聲及指(zhi)紋(wen)等指(zhi)令(ling)開(kai)啟。鎖具不單(dan)是防護用(yong)(yong)(yong)品，還具有“管理”和“裝飾(shi)”的(de)作用(yong)(yong)(yong)。在國際交往中(zhong)也有一種(zhong)禮(li)儀，用(yong)(yong)(yong)贈送(song)象征(zheng)性(xing)的(de)“鑰匙(chi)”作為(wei)友誼的(de)表(biao)示。