The relative strength index ( RSI ) is a momentum indicator that evaluates overbought or oversold conditions by measuring the magnitude of recent price changes for various assets. The index was introduced in 1978 by technical analyst J. Welles Wilder Jr. in his book New Concepts in Technical Trading Systems.
The RSI is displayed as a line graph that moves between two extremes, which is called an oscillator. Its reading can range from zero to 100
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