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ETF trading is the buying and selling of exchange-traded funds to gain exposure to a broad range of assets and speculate on price fluctuations.
An exchange-traded fund (ETF) is a type of pooled investment security that operates much like a mutual fund. Typically, ETFs will track a particular index, sector, commodity, or other assets, but unlike mutual funds, ETFs can be purchased or sold on a stock exchange the same way that a regular stock can. An ETF can be structured to track anything from the price of an individual commodity to a large and diverse collection of securities. ETFs can even be structured to track specific investment strategies.
The first ETF was the SPDR S&P 500 ETF (SPY), which tracks the S&P 500 Index, and which remains an actively traded ETF today.
source :-investopedia
