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most electronic circuits can be modelled as two port networks. one is the input port and the other is the output port. here i would like to say that a transistor is not called a two port network but a transistor circuit can be seen as a two port network. consider the common emitter amplifier. the base and emitter terminals can be visualized as being the input port and the collector and emitter terminals as the second port (the emitter is common in both the ports, thats the reason for the name common emitter)
actually any circuit is visualized as being a two port network to calculate the different h and y parameters. get a good circuits theory book. you will find a better explanation.
We start things from theoretical viewpoint as we start for transitor as two port network! Is that what happens for every device or otherwise stated like junctions in microwaves?
One historic item is that two port theory started very early back in the days of telephone and power distribution. A great deal of theory was done and this made it useful to have new circuit devices analyzed in the old method.
Two port analysis is becoming less used and people do not use the proper terminology. The terms series and parallel applied to two port networks involve either the input or output ports. Either two two-port network inputs are put in series or parallel and their outputs can be either.
When the output of one network is connected to the input of another, the proper term is tandem.
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