A sandwich is a food item typically consisting of two slices of bread with various fillings in between. Common fillings include meats, cheeses, vegetables, and spreads. Sandwiches can be served cold or hot and are popular for meals and snacks due to their convenience and versatility. The concept of a sandwich dates back to the 18th century and is often attributed to John Montagu, the 4th Earl of Sandwich. Today, sandwiches come in many forms, including submarine sandwiches, wraps, and paninis, making them a staple in many cuisines around the world.