The Relative Strength Index is a technical indicator that measures the magnitude of up days versus down days. The RSI can be used to identify periods of overbought or oversold conditions in the market.

The Relative Strength Index (RSI) is a technical momentum indicator that helps traders analyze stocks, futures, and currencies. The RSI is simply calculated by taking average directional movement in the price over an arbitrary time period and dividing it by the standard deviation of such directional movements.

Relative Strength Index (RSI) is a velocity indicator utilized in technical analysis to determine whether commodities or further properties are overbought or oversold. J Wells Wilder Jr. developed this indicator in the edition "New Concepts in Technical Trading Systems", which was published in 1978. RSI states that a price over 70 indicates that the safety may be overbought or overrated and may be ready for a direction change or an accurate fall in price.
RSI studies less than or equal to 30 indicate oversold or misjudged situations.