Doing so won’t fully alter the image you are shooting — it will still look natural — but it will soften up the lighting.
For example, the polarizer filter allows you to lessen the amount of glare. Doing so won’t fully alter the image you are shooting — it will still look natural — but it will soften up the lighting. In this way, you can diffuse the light and lower its polarizing influence so that a viewer’s attention goes to the subject of your photo instead of the unfiltered image’s bright, abrasive tone.