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What is diode?

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It is the fussion of two type of extrensic semi conductor 1)n type 2)p type
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Diode

(1) a two-terminal device that permits the flow of electric current in only one direction. Diodes are most often constructed by abutting n-type and p-type regions of a semiconductor, that has significantly higher electrical conductivity in one direction (forwardbiased) than the other (reverse-biased). Diode devices may be specially designed for low-power, high switching speed applications (signal diodes) or higher-power applications (rectifier diodes).

(2) a two terminal device that conducts in only one direction.
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