sinalot

Hi guys, I am a newbie with HTML5 and i have some questions: which is the difference between these tags? 1) <button type="button" onclick="function()>CIAO</button> 2) <input type="button" onclick="function()" value="CIAO"> 3) <button type=submit>INVIA</button> 4) <input type="submit" value="INVIA"> According to me, 1) and 2) are the same thing (simple button). Also 3) and 4) (a way to submit form). Which form is used normally? Thanks