There are many examples of these.
I would compare a linear device as a device giving a linear output as a result of the input. This can be an amplifier or simply the circuits that makes up the amplifier.
A non-linear device could be a computer chip or a logic chip that is either on or off (only 2 stages) on both input and output.
Some devices combine linear and non linear working modes. A typical OpAmp has got 2 inputs that can vary, where as the output is either On (close to input voltage of the circuit) or Off (close to input negative voltage or GND of the circuit)
Other forms of linearities can be within a single transistor.
It may have a linear voltage curve. This curve can also be non linear. This most often very dependent upon temperature.
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non linear
Usually non-linear.Usually non-linear.Usually non-linear.Usually non-linear.
Non-linear.
You can measure things with a linear scale. Practically impossible with a non-linear scale.
Linear is a straight line and non linear could be a curve or anything but a straight line