Resistors are fundamental electronic components that limit the flow of electric current in a circuit. They are used to control voltage and current levels, ensuring that other components operate safely and effectively. Resistors come in various types, including fixed, variable, and specialty resistors, each serving different purposes in electronic designs. The resistance value of a resistor is measured in ohms, and it plays a crucial role in determining how much current will flow through a circuit. Understanding resistors is essential for anyone working with electronics, as they are integral to circuit design and functionality.