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Generally diodes are allowed to pass the current in a particular direction. It may be forward direction (Forward Bias) or opposite direction (Reverse Biased).Diode includes crystal and vaccum tube devices. In first radio receivers using Crystal diode .gaseous state diodes also available,its called thermionic tube appearanced to incandescent light bulbs.The recent diodes are based on semiconductor p-n junctions. In a p-n diode, conventional current can flow from the p-type side ie anode to the n-type side ie cathode, but cannot flow in the opposite direction. Another type of semiconductor diode, the Schottky diode, is formed from the contact between a metal and a semiconductor rather than by a p-n junction. The best example of semiconductor diode is Zener diode.The most application of dide is Rectification. Rectificatiion refers that alternate current (AC) can be converted into direct current(DC).