What is RSI in trading?
RSI (Relative Strength Index) is a momentum oscillator measuring the speed and magnitude of recent price changes on a 0-100 scale. Above 70 is conventionally considered overbought; below 30 is oversold. Developed by J. Welles Wilder in 1978, RSI is one of the most widely used technical indicators.
More detail
The standard RSI setting is 14 periods, used by virtually every charting platform out of the box.
RSI thresholds are not predictions — in strong trends, RSI can stay above 70 (or below 30) for weeks.
RSI divergence (price making a new high while RSI makes a lower high) is often the strongest signal in the indicator.