An ETF, or exchange-traded fund, is a fund whose units are listed on the stock exchange and bought or sold through your trading account like any share. Most Indian ETFs track an index such as Nifty 50, Nifty Next 50 or Nifty Bank, or an asset such as gold or silver. Buying one unit of a Nifty 50 ETF gives you a tiny slice of all fifty companies at once. ETFs usually have lower expense ratios than actively managed mutual funds, and you can trade them during market hours at live prices. The trade-offs are brokerage and the bid-ask spread, and some ETFs are thinly traded so the spread can be wide. Units sit in your demat account. For a beginner who wants market exposure without picking stocks, an index ETF or index fund is a common and simple starting point.