Exchange-traded notes (ETNs) are debt instruments issued by financial institutions that provide returns linked to a specified index or benchmark. Unlike exchange-traded funds (ETFs) or mutual funds, ETNs do not hold assets like stocks or bonds. Instead, they rely on the issuer’s creditworthiness. Tracking error occurs when the performance of an investment fund deviates from its benchmark index due to operational factors like fees, rebalancing, or dividend treatment. Since ETNs directly track the performance of the underlying index through a structured debt instrument, they are immune to the operational causes of tracking error.