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What is Depletion Region ?????

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What is depletion region? Depletion means to reduction or decrease  in quantity of something. For example, oil depletion  refers to decrease in oil production from a particular  oil well, region, or geographic area over a given  time. Similarly, in semiconductor physics, the depletion region refers to a region where flow of charge carriers are decreased over a given time and finally results in empty mobile charge carriers or full of immobile charge carriers. P-type and n-type semiconductor The p-type semiconductor is formed by adding  trivalent impurities to the pure or intrinsic  semiconductor while n-type semiconductor is  formed by adding pentavalent impurities to the pure  or intrinsic semiconductor. In p-type semiconductors, holes are the majority  charge carriers while free electrons are the minority  charge carriers.  On the other hand,  in n-type  semiconductors free electrons are the majority  charge carriers while holes are th