An Exchange Traded Fund (ETF) is a type of investment fund that holds a collection of assets, such as stocks, bonds, or commodities, and is traded on a stock exchange like a regular stock. ETFs are designed to track the performance of an underlying index (e.g., S&P 500, FTSE 100) or asset class, and they provide investors with diversification, liquidity, and low-cost exposure to a broad range of securities. ETFs can be traded throughout the day at market prices, unlike mutual funds, which are priced only once at the end of the trading day.

Nippon India Nifty BeES ETF is one of the earliest and most popular ETFs in India. It was launched in 2002 by Nippon India Mutual Fund (formerly Reliance Mutual Fund). This ETF aims to track the Nifty 50 Index, offering investors exposure to India’s top 50 blue-chip companies through a single tradable security. Unlike mutual funds, it is bought and sold on the stock exchange (like NSE and BSE) in real-time at market prices, making it highly liquid and transparent. 

The SPDR S&P 500 ETF (also known as “Spider”) was the first exchange-traded fund, designed to track the performance of the S&P 500 index. It allowed investors to gain broad exposure to the U.S. stock market at a low cost and with high liquidity. By the 2000s, ETFs became a global investment tool, with financial markets around the world offering ETFs tracking everything from commodities like gold to specialized sectors like technology and energy.