Biasing is crucial because it establishes the amplifier's quiescent conditions, which have an impact on the circuit's AC performance. Transistors can be studied and analysed with proper Biasing.

FET amplifiers typically use voltage biasing or current biasing to operate the FET in the active region for linear amplification.

There are several methods to bias NPN transistors, but two common methods are Base bias Emitter bias It's important to note that biasing must be done correctly to ensure the transistor operates in its active region and amplifies the input signal. Incorrect biasing can cause the transistor to operate in saturation or cutoff regions, leading to distortion or no amplification.

Biasing is basically done in DC supply because it is constant voltage. And it makes it easy to understand the biasing techniques.

Knee Voltage is defined as the Proper Minimum \V_{CE}\), for faithful amplification of the transistor, the collector-emitter voltage \(V_{CE}\) should not fall below 0.5 V for germanium and 1.0 V for a silicon transistor.