A deli sandwich is a type of sandwich typically made with sliced meats, cheeses, and various toppings, served between two slices of bread. Common ingredients include turkey, ham, salami, and Swiss cheese, along with condiments like mustard and mayonnaise. Deli sandwiches are popular in delicatessens, where they are often made to order. These sandwiches can vary widely in style and ingredients, depending on regional preferences. For example, the Reuben is a well-known deli sandwich made with corned beef, sauerkraut, Swiss cheese, and Russian dressing on rye bread. Deli sandwiches are enjoyed for their convenience and versatility, making them a favorite for lunch or casual meals.