A sandwich is a food item made of two or more slices of bread with one or more layers of a filling. The bread can be used as is, or it can be coated with butter, oil, mustard or other condiments to enhance flavor and texture.
An early form of sandwich is attributed to the ancient Jewish sage Hillel the Elder, who is said to have wrapped meat from the Paschal lamb and bitter herbs in a matzo (or flat, unleavened bread) during Passover.