What is the Relative Strength Index (RSI)? The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder Jr. in 1978. It measures the speed and magnitude of price movements, helping traders identify overbought and oversold conditions in the market. RSI is displayed as a line graph that moves between 0 and … Continue reading Relative Strength Index (RSI): Complete Guide for Forex Traders