Wheat flour is a powder made from the grinding of wheat used for human consumption. Wheat varieties are called "soft" or "weak" if gluten content is low, and are called "hard" or "strong" if they have high gluten content.
Flour is ground wheat. It's used in many different culinary applications, from baked goods like breads, cakes, and pie crusts to roux for sauces and airy batters. Most conventional flours are made from wheat kernels (or wheat berries), which consist of endosperm, a germ, and bran.