鎖具是(shi)指(zhi)起封閉(bi)作用(yong)(yong)(yong)的(de)器具,它包(bao)括鎖、鑰匙(chi)及(ji)其(qi)附件,一(yi)般(ban)解釋為“必須用(yong)(yong)(yong)鑰匙(chi)方能開脫的(de)封緘器”,現在(zai),鎖具除用(yong)(yong)(yong)鑰匙(chi)開啟(qi)外,還可(ke)以用(yong)(yong)(yong)光、電(dian)、磁(ci)、聲及(ji)指(zhi)紋等指(zhi)令開啟(qi)。鎖具不單(dan)是(shi)防護用(yong)(yong)(yong)品,還具有“管(guan)理”和“裝(zhuang)飾”的(de)作用(yong)(yong)(yong)。在(zai)國際交往中也有一(yi)種禮儀,用(yong)(yong)(yong)贈送象(xiang)征性(xing)的(de)“鑰匙(chi)”作為友(you)誼的(de)表示(shi)。