A set of components that splits an input voltage into multiple parts that add up to the whole. Voltage dividers are used to take an initial voltage and turn it into a lower one.
A common example is two resistors in series. You could visualize voltage like a set of stairs. The voltage splitter circuit sends the current through a device that produces a constant lower voltage, which is like a landing in your staircase that is lower than the higher landing you started off on.