Website programmer != computer engineer. XD
Alright then~
Transistors change the channel of electricity and split them along two lines. Because of this, often, this ends up amplifying, since the output becomes greater then the input.LEDs = Light-emitting diodes.
I'm not really sure, but it has something to do with photons and electroluminescence. Oh, and since photons can have different levels of energy, the light given off can be different colors.