That is to extend your study permit. You need a new study permit because you changed DLI without completing the conditions of your study permit. You should be checking with IRCC if your permit was cancelled as the DLI on your permit must inform IRCC if you dropped out.
if you have no idea about what you are talking about. why do you confuse people in here??
if unable of answering clear questions why do you confuse the people??
I said clearly it is to ( change the conditions). I did not make that up. it is written on ircc website.