What does liquidation mean?

"Liquidation is a term in financial transactions, which means that long investors sell or buy back the products they sell short. It can be used for trading products such as stocks, futures, spot, options and foreign exchange. For example: bull market → buy positions → sell positions; Bear the market → sell and open positions → buy and close positions. Closing positions can be divided into hedging closing positions and forced closing positions, both of which are to reduce trading risks. "

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