A sandwich is a food item consisting of two or more slices of bread with one or more fillings between them.
Or one slice of bread with a topping or toppings, commonly called an open sandwich.
Sandwiches are a widely popular type of food, typically taken to work or school, or picnics to be eaten as part of a packed lunch. They generally contain a combination of salad vegetables, meat, cheese, and a variety of sauces.