The Invesco QQQ Trust (QQQ) tracks the Nasdaq-100 Index, which gives investors exposure to large-cap growth stocks, primarily in the technology sector. This ETF is known for its high liquidity and strong historical performance. However, its tech-heavy composition exposes it to sector-specific volatility and increased risk during economic downturns. Valuations can be high, particularly in bullish markets. Overall, suitable for aggressive investors seeking growth, but caution is warranted due to potential drawdowns in tech stocks.