What are the key ingredients in making bread?

Six basic ingredients are necessary for making bread:
Bread Flour: Develops elasticity when mixed with liquid and kneaded. It forms the structure of the dough as it traps the gases which are created when the yeast ferments sugar.
Liquid: Makes a workable dough when combined with the dry ingredients. It also provides the moisture for the yeast to grow.
Sugar: Provides food for the yeast, adds flavor to the bread and aids in browning the crust.
Salt: Keeps the yeast working at a steady, even pace, enhances taste and strengthens the dough structure.
Fat: Increases the elasticity of the flour, makes the crust tender and helps keep bread fresher longer.
Yeast: A single-cell living organism which releases gases that make bread rise when given moisture, food and oxygen