What role does a resistor play in an electrical circuit?

A resistor plays a vital role in an electrical circuit by limiting current flow. It introduces a specific amount of resistance into the circuit, which controls the amount of current that can pass through based on Ohm's Law (V = IR). By doing so, resistors help to protect sensitive components from excessive current that could cause damage, as well as regulate the overall functioning of the circuit by adjusting voltage levels across various parts of the system. This limiting of current flow is crucial in preventing overheating and ensuring that the circuit operates within safe parameters, maintaining the integrity and longevity of the entire electronic system.