A lantern is an often portable source of lighting, typically featuring a protective enclosure for the light source — historically usually a candle or a wick in oil, and often a battery-powered light in modern times — to make it easier to carry and hang up, and make it more reliable outdoors or in drafty interiors. Lanterns may also be used for signaling, as torches, or as general light-sources outdoors. The lantern enclosure was primarily used to prevent a burning candle or wick being extinguished from wind, rain or other causes. Some antique lanterns have only a metal grid, indicating their function was to protect the candle or wick during transportation and avoid the excess heat from the top to avoid unexpected fires.

Another important function was to reduce the risk of fire should a spark leap from the flame or the light be dropped. This was especially important below deck on ships: a fire on a wooden ship was a major catastrophe. Use of unguarded lights was taken so seriously that obligatory use of lanterns, rather than unprotected flames, below decks was written into one of the few known remaining examples of a pirate code, on pain of severe punishment.

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