What is the purpose of a resistor network?
Imagine you have an IC (microcontroller, shift register etc.) with 10 outputs, each one requiring an additional pull-up or pull-down registers. Or image you have 10 LEDs that need to be conntected to Vcc or ground via a resister.

In such cases the resister network comes in handy. You only need to use one or two resistor networks instead of 10 individual resistors. It's helpful on a breadboard to reduce the number of wires. And it's helpful on a production board as it reduced the number of components that need to be placed.