Answer / noob

Base is thin layer sandwiched between emitter and collector which allows the electrons(or holes in pnp transistor)to move from emitter to collector. The majority charge carriers moves from emitter to collector via base which results in collector current.

Answer / priya bansal

base is the only reason of formation of two junctions in transistors. and also it absorbs minority current going from emitter to collector region.

Answer / nayan patil

For The process of Amplification OR to give the external Dc power to ciircuit

Answer / raju

to protect transistor from high voltages and for required output voltage

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