The main ingredient in biscuits is flour, typically all-purpose flour. Flour serves as the base for the structure of the biscuit and is combined with other ingredients such as baking powder, salt, fat (like butter or shortening), and liquid (like milk or water). The choice of flour significantly influences the texture and flavor of the biscuit. When combined with a leavening agent, the flour helps create a light and fluffy texture. Biscuits can be sweet or savory and are popular in various cuisines around the world.