Finger nail polish comes off?

Over the past 2 or 3 months I have gotten my nails done,at three different places. Every time the next day the nail polish peels off. The last time I bought some nail polish and brought it to the salon. I'm getting aggravated, cause I don't see the point in getting them painted!!! I haven't tried painting them at home. What are we doing wrong, why does it peel off, the next day?