Explain why holes are made in hanging banners and hoardings? (plz answer fast)

HOLES ARE MADE IN HANGING BANNERS AND HOARDINGS SO THAT THE AIR CAN CROSS THE BANNER WITHOUT ANY LOSE TO THE BANNER IF THESE HOLES ARE NOT MADE IN THE HOARDINGS OR BANNERS THEN DUE TO THE PRESSEURE OF AIR THE BANNER WILL FALL DOWN

Holes are made in hanging banner because if the holes are not made it does not allow air to pass through them air may tear it or dis place it