Voltage drop refers to the reduction in electrical voltage as it travels through a conductor, such as a wire. This phenomenon occurs due to the resistance of the material, which causes some energy to be lost as heat. The longer the wire and the higher the current, the greater the voltage drop. In practical terms, voltage drop can affect the performance of electrical devices. For example, if a light bulb is far from the power source, it may not receive enough voltage to operate efficiently. Understanding voltage drop is essential for designing effective electrical systems.