A Green LED (Light Emitting Diode) is a semiconductor device that emits green light when an electric current flows through it. Like all LEDs, it is a polarized component, meaning it has two terminals: Anode (+) – the longer lead, where positive voltage is applied. Cathode (–) – the shorter lead, connected to ground or negative voltage. The green LED typically operates at a forward voltage of about 2.0–3.2 V (depending on type and brightness) and requires a current-limiting resistor (usually between 220–1kΩ in 5V circuits) to prevent it from burning out. Its forward current rating is usually around 20 mA, though high-brightness types may vary. Green LEDs are widely used for: Status indicators (ON/OFF, ready signals). Traffic lights and signal systems. Electronic circuits for debugging or feedback. Decorative and display lighting. They are popular because green is easily visible to the human eye and often used to represent “safe,” “ready,” or “go” conditions in devices.