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The type of electrical current that changes direction periodically is alternating current (AC). This current flows in one direction and then reverses to flow in the opposite direction, typically in a sinusoidal wave pattern. This periodic change in direction occurs at a specific frequency, commonly 50 or 60 Hertz, depending on the region.

Alternating current is widely used for power distribution due to its ability to easily transform voltages using transformers, allowing for efficient transmission over long distances. Additionally, the periodic nature of AC makes it suitable for powering electric motors and other devices that require varied voltage and current levels.

In contrast, direct current (DC) flows in a single direction and maintains a constant polarity, making it unsuitable for applications requiring periodic reversal of flow. Pulsating current refers to a type of DC that varies with time but does not reverse direction—it's essentially a fluctuating DC. Steady current, while implying stability in one direction, is also not subject to the periodic changes inherent to AC. Hence, the defining characteristic of AC as a current that periodically changes direction firmly supports its distinction from the other types of current.