In the 21st century there has been considerable debate over the precise definition of sandwich; and specifically whether a hot dog or open sandwich can be categorized as such. In the United States, the Department of Agriculture and the Food and Drug Administration are the responsible agencies. The USDA uses the definition, "at least 35% cooked meat and no more than 50% bread" for closed sandwiches, and "at least 50% cooked meat" for open sandwiches. In Britain, the British Sandwich Association defines a sandwich as "any form of bread with a filling, generally assembled cold", a definition which includes wraps and bagels, but excludes dishes assembled and served hot, such as burgers.
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Sandwiches are a popular type of lunch food, taken to work, school, or picnics to be eaten as part of a packed lunch. The bread may be plain or be coated with condiments, such as mayonnaise or mustard, to enhance its flavour and texture. As well as being homemade, sandwiches are also widely sold in various retail outlets and can be served hot or cold. There are both savoury sandwiches, such as deli meat sandwiches, and sweet sandwiches, such as a peanut butter and jelly sandwich.