KDJ is a technical indicator, and J stands for fluctuation indicator. This indicator is widely used in investment and trading fields such as stock market and futures market, and its main function is to help traders identify price trends and trading opportunities. KDJ consists of three lines, namely K line, D line and J line. Their changes can help traders better analyze market trends and make more accurate decisions.

In technical analysis, J of KDJ usually refers to volatility index. Volatility index is an index used to measure price fluctuation, including volatility and relative strength index. Through the volatility index, traders can understand the risks and opportunities of the stock market, and can make adjustments according to the changes of the volatility index and formulate their own trading strategies.

In stock trading, KDJ indicator is a widely used analytical tool. J of KDJ is a volatility index, which can reflect the volatility and price trend of stocks. Traders can understand the market trend by analyzing KDJ indicators and volatility indicators and formulate corresponding trading strategies. Especially for short-term traders, using KDJ index can improve their trading efficiency and success rate.