Transistor biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC input signal can be amplified correctly by the transistor. Biasing is essential for the proper functioning of a transistor, and it involves making the emitter-base junction forward-biased and the collector-base junction reverse-biased so that the transistor remains in the active region. The two junctions of a transistor should be forward or reverse-biased to operate the transistor in the cutoff, active region, or saturation region. The process of applying a DC voltage source to the transistor is known as biasing. Transistor biasing is achieved using biasing circuits, which can be simple or elaborate depending on the application. There are several types of biasing circuits, including fixed bias, collector-to-base bias, fixed bias with emitter resistor, voltage divider bias, and emitter bias. The most commonly used methods for transistor biasing are fixed bias circuit (single base resistor biasing) or base bias, collector-to-base bias circuit, voltage divider bias circuit (VDB) or self-bias, and emitter bias.