The main component of a typical sandwich is bread. Bread serves as the foundation that holds various fillings together, which can include meats, cheeses, vegetables, and condiments. The choice of bread can vary widely, with options ranging from white and whole grain to baguettes and wraps. Sandwiches can be made in countless varieties, reflecting regional tastes and dietary preferences, making them a popular choice for quick meals or snacks. Overall, without bread, a sandwich would not fulfill its definition or traditional structure, which is why it is recognized as the key component.