The Relative Strength Index, or RSI, is used to locate overbought and oversold conditions in financial markets. As an oscillator type indicator it does this by moving up and down within a range of 0 to 100, with 0 representing the most oversold conditions, and 100 representing the most overbought conditions. Typically any reading above 70 is considered overbought and ripe for a reversal, while readings below 30 are considered oversold and also ripe for a reversal. Some traders use the 80 and 20 levels as their signal points.