Granulated sugar and powdered sugar are not exactly the same thing, even though they're both made from sugar. Powdered sugar, also known as confectioner's sugar, is made by grinding granulated sugar into a fine powder, which makes it dissolve more easily in liquids. This can affect the texture and consistency of your final product, so it's not always a straightforward swap.
For example, if you're making a meringue or a whipped cream, using powdered sugar can actually be beneficial because it dissolves so easily and won't leave any grainy texture behind. But if you're making something like cookies or cake, using powdered sugar can affect the final texture and make it more dense or dry.
So, why should you care about the difference between granulated and powdered sugar? Well, if you're an avid baker, you know that the right ingredients can make all the difference in the world. Using the wrong type of sugar can affect the flavor, texture, and overall presentation of your final product, which can be disappointing if you're planning to serve it to guests or give it as a gift.