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A current limiting resistor is also in the circuit for limiting the base current because it could be damaged the transistor if the source current is greater than 5mA.

Similarly in the cut-off region, no current flows from emitter to collector then it acts as a turn off the switch.

Therefore the user cannot connect the load whose current is greater than 800mA

In saturation region full current flows from emitter to a collector that’s range is 110 to 800mA and in this condition, it acts as a turn on a switch.

In switching application it works in two regions such as saturation and cut off region

Therefore, it could be used in that application such as switching and amplifications where BC547 transistor has been using.But the only difference between them is the continuous collector current and total power dissipation of this transistor.This 2N2222 NPN transistor has almost the same technical specifications as BC547 NPN transistor.