An ETF, or Exchange-Traded Fund, is a type of investment fund traded on stock exchanges, similar to stocks. ETFs hold a collection of assets, such as stocks, bonds, or commodities, and allow investors to diversify their portfolios easily. In cybersecurity, ETFs may be relevant when discussing financial sector risks, cyber threats to trading platforms, or investment in cybersecurity-focused funds. Cybersecurity ETFs specifically invest in companies involved in digital security, offering exposure to the growth of the cybersecurity industry. Understanding ETFs is important for both financial and cybersecurity professionals, as cyber incidents can impact ETF performance and trading.