plz explain input and output characteristics of transistor

Hi Pooja!
In common emitter configuration, input characteristics is the plot obtained by tracing the variation of input current IB with the input voltage VBE. Similarly, the variation of output current IC with the Collector to emitter voltage VCE is known as output characteristics.
Circuit diagram for tracing characteristic curves of transistor in CE configuration:

Hope it is clear to you!
Best wishes!!

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