Forget iPads and game systems and jewelry. The #1 gift under the Christmas tree this year will be...gift cards.

80% of shoppers say they plan to purchase at least one gift card this holiday season, a survey by the National Retail Federation found.

We're not at all surprised. Gift cards are practical, convenient and pretty much error proof.

But before you go out and buy gift cards for everyone on your list, there are a few do's and don'ts you n you need to know to be gift card smart...