What does it mean by voltage divider bias?
The Voltage at the junction of two resistors connected in series to a source Voltage can be made to equal any value greater than zero Volts and less than the value of the source Voltage by selecting the ratio of the resistance values of the two resistors. The two resistors in this application are known as Voltage dividers because they divide the source Voltage into two separate Voltage drops (one drop across each resistor) whose sum equals the source Voltage. If the Voltage at the junction of the two resistors is applied (directly or through another circuit element) to the base of a transistor then it is said to be the bias Voltage for that transistor. This is just an example of one use of a resistive Voltage divider whose output is used to bias a transistor. I doubt that you will hear it called Voltage divider bias very often even though that is what it actually is.
