Cold sandwiches are a type of food made by placing various fillings between two slices of bread, which are served at room temperature or chilled. Common fillings include meats, cheeses, vegetables, and spreads like mayonnaise or mustard. They are popular for their convenience and versatility, making them a favorite for lunches and picnics. These sandwiches can be made with different types of bread, such as whole grain, sourdough, or baguette. Cold sandwiches are often enjoyed with sides like potato chips or pickles, and they can be customized to suit individual tastes, making them a staple in many diets.