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Semiconductors are a class of materials whose electrical conductivity lies between that of a Conductor and of an insulator. Semiconductor Devices plays pivotal role in electronics. There are a lot of Semiconductor devices viz : P-N Junction diode , transistor , LED , Photo diode , FET , MOSFET , UJT , SCR , LDR , Logic gate , amplifier , flip - flop , tunnel diode , PIN diode , triacs , diacs , rectifier etc. Without Semiconductor we can not imagine electronics. When a third doped element is added to a crystal diode in such a way that two P-N Junctions are formed, the resulting device is known as a transistor. Semiconductor devices are used in IC as well as digital world. BJT transistor is very practical transistor. Transistor acts as an amplifier.