RSI is a momentum indicator that moves between 0 and 100. It compares the size of recent gains with recent losses, usually over 14 periods.
Readings above 70 are often called "overbought" and below 30 "oversold", but in strong trends RSI can stay at extremes for a long time. Many traders also watch for divergence — when price makes a new high or low but RSI does not.
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