Switches play an important role in the interior beauty of a home. There are various kinds of switches which can be used in your house holds depending on what you want. Style, looks, effectiveness and a whole lot more characteristics with which we can measure switches.
A dimmer switches are kind of light switches that allow a light to be dimmed or brightened continuously. Conceptually, a variable resistor in series with a lamp would allow adjustment of its brightness, but this would be inefficient and costly owing to power dissipated in the resistance as heat. Historically, and still used for some theatrical lighting, a variable autotransformer can be used to adjust the voltage applied to the lamps, and so, the brightness; but this equipment is too large to fit into a standard wall box.
In modern homes most lights are operated using switches set in walls, usually 6-10 inches (15-25 cm) away from a door, to operate overhead ceiling lights. In torches (flashlight) the switch is often near the bulb, but may be in the tail, or even the entire head itself may constitute the switch (rotated to turn the light on and off).