If their stay is longer than 48 hours or if they need to leave the airport during their layover, Indian nationals taking a connecting flight through Canada might require a transit visa. You may travel through Canada without incident or stress if you prepare ahead and make the necessary preparations. You can contact Visa 24 Services if there is any confusion regarding your transit visa. Read more: https://timesofrising.com/do-i-need-a-transit-visa-for-a-connecting-flight-to-canada/