Bodylanguageisusedbypeopleforsendingmessagestooneanother.Itisveryusefulbecauseitcanhelpyoumakeyourselfeasilyunderstood.Whenyouaretalkingwithothers,youarenotjustusingwords,butalsousingexpressionsandgestures.Forexample,wavingone'shandistosay"Good-bye."Asmileandhandshakeshowwelcome,andclappinghandsmeanscongratulations.Noddingtheheadmeansagreement,butshakingtheheadmeansdisagreement.