LED is known as Light Emitting Diode. It is an electrical component, which emits light when electric current flows through it. It is a light source based on semiconductors. These are generally molded into lighter shape. They are very effective and are very cheap at cost.
They are used for various purposes:
1. Displays
2. TV backlights
3. Also used for dimming of lights
They are of different types:
1. Miniature
2. High power
3. Flash
4. Alphanumeric
And many more.
I hope this answer helps!😊