The primary ingredient used in making bread is flour. Bread recipes vary widely across cultures and types, but the foundation is typically made from wheat flour, which contains gluten, a protein that gives bread its structure and elasticity. Other common ingredients include water, yeast, and salt. The type of flour used can impact the texture and flavor of the bread, with different varieties like whole wheat, rye, or all-purpose flour each contributing unique characteristics to the final product. Bread has been a staple food in many cultures for thousands of years.