Standard diode - The diagram which was shown under the definition of diodes on my website is that of a standard diode. These are the diodes which allow current to flow in one direction.
Zener diode - is a diode which allows current to flow in both directions. However in the reverse direction, current will only flow when its voltage is higher than its breakdown voltage known as the Zener voltage.
Varicap diode - also operates in the reverse bias mode but this time its reverse voltage can be used to vary the capacitance. The higher the reverse voltage, the lower the capacitance.
Light Emitter diode - operates in the forward bias mode like the standard diode and it will emit light while doing so.
Schottky diode - is a very fast switching diode that can be used in circuits which have a very high frequency. This operates in the forward bias mode.
Photodiode - operates in the reverse bias mode. It is a diode which allows current to flow through when it is exposed to light. The stronger the light, the higher the reverse current.
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