pl filters what do they do?

Hi all I made a different video specifically on polarizers as they make such a big difference to glare and reflections when flying over water. In my examples, you would probably want the reflections as the clouds look great, but I just wanted to demonstrate the effect these filters have. Also...

Tested out the Skyreat ND filters for DJI Mavic AIR.. also good if you wondered what PL filters do.