A neon lamp is a gas-discharge lamp that contains neon gas. When an electric current is applied to the lamp, the neon gas emits a bright orange-red light. Neon lamps are used in a variety of applications, including signs, outdoor lighting, and Christmas lights.
The purpose of the resistor in a neon lamp circuit is to limit the current flowing through the lamp. Without the resistor, the current would be too high and could damage the lamp. The resistor limits the current by creating a voltage drop across its terminals. The voltage drop is proportional to the amount of current flowing through the resistor.