When transistors are used in digital circuits they usually operate in the

Active region

Breakdown region

Saturation and Cutoff regions

Linear region

The transistor works as a closed switch in the saturation area and as an open switch in the cutoff zone.
Digital circuits operate 0 or 1 in binary form. So saturation and cut off regions can operate the circuit.
In the saturation zone (closed switch), output ?1? is produced, whereas in the cut off zone (open switch), output ?0? is produced.

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