Explanation: For an LED (Light-Emitting Diode) to emit light, it must be **forward biased**. Forward bias occurs when a positive voltage is applied to the LED's anode (the longer lead, typically) and a negative voltage to its cathode. This allows current to flow through the semiconductor junction. As electrons move across the junction and recombine with holes, they release energy in the form of photons, which is the light we see. Conversely, **reverse bias** applies voltage in the opposite direction, blocking current flow and preventing light emission. Applying excessive reverse bias can also damage the LED. Logic 0 (Lo) and Logic 1 (Hi) are digital voltage states and do not describe the specific electrical bias required for an LED's fundamental operation as a diode.