It is a system of voting that allows a citizen to individually number and rank all candidates for both houses of parliament according to their preferences. Which means a citizen's vote can still be counted, even if their first choice of candidate is eliminated due to a lack of votes.
IN CLASS! First of all brainly is to help you answer questions not cheat on them. Please do not do this to cheat. (Although this question that your teacher asked has no use to anyone getting a job) ;)