Flashlights provide nice, portable light, useful for emergencies and places where there aren't fixed light fixtures. In some parts of the world, they are called torches.
Most flashlights use batteries for power. Flashlights come in many different sizes and shapes. They can also produce light of different intensity and focus. Some have rechargeable batteries or ones that can be charged by winding a handle.
Flashlights can also supply entertainment: shadow puppets, scary faces, light patterns.