ETFs provide a straightforward, cost-effective way for investors to access diverse markets, blending the convenience of stock trading with broad exposure. Major funds like Invesco QQQ (Nasdaq-100), Vanguard S&P 500, and iShares MSCI EAFE (Europe and Asia) allow access to various sectors, while iShares STOXX Europe 600 targets top European firms. Due to European regulations, U.S.-listed ETFs are restricted, but European investors can find equivalents on local exchanges. With over 12,000 ETFs worldwide, these funds offer flexible trading options via online and traditional brokers.