A flashlight is a portable, handheld electric light. They are simple tools designed to illuminate hard-to-reach spaces and dark environments.
Flashlights usually include an incandescent bulb or LED, a reflector to direct the light, a battery or batteries, and a switch, all housed in a durable case.
There are several variants of the flashlight, from simple handheld models to lights mounted on the head. They can also be held as a lantern, equipped with a movable head, or illuminate the entire case as a signal wand. Flashlights also vary in size, from penlights or keychain lights to heavy duty lights that can emit several hundred lumens.