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

How accurate are your measuring cups?

How Many Cups in a Pint? (Easy Conversion Chart!) - Bake It With Love

How to Properly Measure Wet and Dry Ingredients, Baking 101

Baking 101: Liquid vs Dry Measuring Cups - Kirbie's Cravings

Baking 101: Liquid Vs Dry Measuring Cups Kirbie's Cravings, 60% OFF

Online Exclusive Zatarain's Red Beans & Rice Mix, zatarains rice

How Many Ounces In A Cup (Free Printable Chart) - Food Lovin Family

Liquid Dry Measurements: Why It Matters 12 Tomatoes, 44% OFF

Dry Vs. Liquid Measuring Cups: Here's What You Need To Know

Top 10 measuring cup for liquid ingredients ideas and inspiration

Free Shipping & EASY Returns 2 cup dry measuring cup

The Best Liquid Measuring Cups of 2024, Tested & Reviewed