What is the difference between polarized sunglasses and non-polarized sunglasses?

[McCammon]

What is the difference between polarized sunglasses and others are not other than price ?

[McCartys]

Protections part (which is most important, of course) if you try on a polarized and some that are not immediately noticeable.?With ordinary sunglasses, everything looks dark, as is always seen with dark sunglasses, but instead if they are polarized, you see everything much clearer, with more light, whether they are all black, it is like clear.?They are more expensive for something ...