Why are there Dry and Liquid Measuring Cups? What's the difference?

I am going out on a limb here and estimating that at least 4 out of every 10 homes now only has 1 set of measuring cups.  And this one set is used to measure

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Free Shipping & EASY Returns 2 cup dry measuring cup

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How to Measure in Cooking and Baking

Free Shipping & EASY Returns 2 cup dry measuring cup

How Many Ounces in a Cup? Food Measurement Conversions