鎖(suo)具是指(zhi)起封(feng)閉作用(yong)(yong)(yong)(yong)的(de)器具，它包括鎖(suo)、鑰匙(chi)(chi)及其附(fu)件，一般(ban)解釋(shi)為(wei)“必(bi)須用(yong)(yong)(yong)(yong)鑰匙(chi)(chi)方能(neng)開(kai)脫(tuo)的(de)封(feng)緘器”，現在，鎖(suo)具除用(yong)(yong)(yong)(yong)鑰匙(chi)(chi)開(kai)啟(qi)外，還可以用(yong)(yong)(yong)(yong)光(guang)、電、磁、聲及指(zhi)紋等指(zhi)令開(kai)啟(qi)。鎖(suo)具不單是防(fang)護用(yong)(yong)(yong)(yong)品，還具有“管理”和“裝(zhuang)飾(shi)”的(de)作用(yong)(yong)(yong)(yong)。在國(guo)際交(jiao)往中也有一種禮儀，用(yong)(yong)(yong)(yong)贈送(song)象征性的(de)“鑰匙(chi)(chi)”作為(wei)友誼的(de)表示(shi)。