In a closed-loop configuration of an operational amplifier (Op-Amp), what is the main purpose of adding feedback resistors?

In a closed‑loop op‑amp circuit, the feedback resistors set the amount of the output that is fed back to the input, which directly determines the overall gain of the amplifier. By choosing the resistor values, you can make the gain stable and independent of the op‑amp’s open‑loop characteristics, which are usually very high and vary with temperature and supply voltage. The feedback network also limits the bandwidth and improves the linearity and stability of the circuit. For example, using a 10 kΩ resistor from the output to the inverting input and a 1 kΩ resistor from the inverting input to ground gives a fixed gain of 10, making the circuit behave predictably regardless of the op‑amp’s internal variations.