A voltage divider will be anything that divides the voltage , not just two resistors but also a zener , a transistor or anything
that can be used in a linear voltage "regulator", all the designs are based an a pass element that introduces a voltage drop and keeps the output level to a constant level,
this is based on a voltage divider.
The only solution that doesn't use a voltage divider is a pulse psu because it is either on (full voltage) or off,
the duration of the on time adjusts the output voltage level.
Alex