Stella Osoba is the Senior Editor of trading and investing at Investopedia. She co-founded and chaired Women in Technical Analysis. She has 15+ years of experience as a financial writer and technical ...

The relative strength index (RSI) is a momentum indicator that measures recent price changes as it moves between 0 and 100.

Among different useful oscillators which traders can identify, RSI or Relative Strength Indicator is the most reliable and renowned momentum indicator. Day traders use it to gain profits during ...