A light-emitting diode (LED) is a component that produces light when an electrical current passes through it. Nowadays, there is a wide range of LEDs available in various colors (red, green, blue, yellow, white), as well as multicolored models, such as RGB LEDs, which can display a variety of hues by combining red, green, and blue. The LED only allows current to flow in one direction, from the anode (positive) to the cathode (negative). In the opposite direction, where current is blocked, it is called the reverse blocking direction. For this electronic circuit, you will need a 220-ohm resistor, an LED, and a breadboard.