What is a 3x inverse ETF?

Related questions

1. Are ETF better than mutual funds?
2. What is Russell 1000 composed of?
3. What is in the QQQ ETF?
4. Is there a Russell 2000 index fund?
5. What is a 2x ETF?
6. What is a 3x ETF?
7. Is QQQ a leveraged ETF?
8. Does Russell 2000 include S&P 500?
9. Can you buy stock in Nasdaq?
10. How does an ETF make money?

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25. #bonds
26. #contracts