Why is polarization good for sunglasses?

Polorized sunglasses will reduce glare!Example...if you wear polorized glasses to the lake...you will be able to see into the water instead of the glare on top of the water!The uv protection isn't better or worse with polorized.......it basically does the squinting for you!Most people that spend alot of time on the water will use polorized..fishing,etc!They are great for driving to...just becareful if your window is already polorized you wont see through it, if you have polorized glasses on..it will look distorted!you wont be able to read digital clocks and stuff as well!!