The bottom portion of the label shows the suggested daily requirements for a few nutrients based on calorie intake. This information may not be present on smaller items because it's not crucial and it isn't specific to the product. When it's on the label, it serves as a good reminder of your general needs based on a 2,000 or 2,500 calorie per day diet.
Now that you know what information is available on the Nutrition Facts labels, make sure you use this information to your advantage by choosing foods that fit into your healthful diet (take a look at my balanced meal plan for ideas). And be sure to look out for any tricky food label claims on the front of the package.