Processing flour involves sifting it, which is a four-letter word. Sifting is the process of separating out the larger particles from the finer ones. This is done by passing the flour through a sieve or sifter, which is a device with a mesh bottom that allows the smaller particles to pass through while trapping the larger ones. Sifting is an important step in baking, as it helps to ensure that the flour is light and airy, which is essential for making cakes and other baked goods.