When we use transistor in an amp circuit the dc biasing circuit should be such that the Q pt should not change its position on DC load despite the changes in $β_{dc}$.

A circuit which can practically achieve this is called as emitter bias circuit. It has got a resistor connected in its emitter $(R_E)$ and base resistor $R_B$ is not being used. Due to this small change, the Q pt. of this circuit becomes very stable. It does not change its position ever due to large changes in $β_{dc}$ value.

$→V_B=V_{BB} \text{volts} \\ → \text{Emittee voltage} V_E=V_B-V_{BE}=V_{BB}- V_{BE}$