A flashlight (usually called a torch outside North America) is a hand-held electric-powered light
source. Usually the light source is a small incandescent lightbulb or light-emitting diode (LED). Typical flashlight designs consist of the light source mounted in a reflector, a lens to protect the light source and reflector, a battery or other power source, and a switch.
In addition to the general-purpose hand-held flashlight, many forms have been adapted for special uses. Head or helmet-mounted flashlights designed for miners and campers leave the hands free. Some flashlights can be used underwater or in flammable atmospheres.
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