What is the difference between 1 cup flour, sifted, and 1 cup sifted flour?

There is a big difference in the weight or amount of flour. 1 cup flour, sifted means you put the flour into the cup and then sift it. 1 cup sifted flour means to set the cup on a counter and sift the flour into the cup until it mounds above the top. Then, with a metal spatula or knife, level it off. Be sure to use a cup with an unbroken rim, referred to as a dry measure as opposed to a liquid measure which has a spout. With this second method you will have the least amount of flour because the flour is aerated. Do not be tempted to shake the cup or tap it as that compacts the flour.