The document discusses the basic components of a sandwich, including the structure or base (bread), moistening agent, and fillings. It then describes different types of bread that can be used for sandwiches, including yeast breads (white bread, whole wheat bread), buns and rolls (sandwich rolls, French/Italian breads), flatbreads (pita, focaccia, tortillas), and quick breads (raised with chemicals rather than yeast). The goal is to identify sandwich components, illustrate sandwich structure, and understand nutrient content.