A sandwich is a versatile and convenient food item consisting of two slices of bread (or a bread roll) with various fillings between them. These fillings can include slices of meat (such as ham, turkey, or chicken), cheese, vegetables (lettuce, tomatoes, cucumbers), spreads (mayonnaise, mustard, hummus), and condiments (ketchup, relish). Sandwiches can be served cold or toasted and are popular for breakfast, lunch, or a quick snack due to their portability and endless variety of flavors and combinations.