Ranges, also called consolidation or chop, are where trend-following strategies bleed and mean-reversion strategies work. Price bounces between a floor (support) and a ceiling (resistance) until a breakout resolves it.
Markets spend more time ranging than trending. Recognizing which regime you are in matters more than any single indicator.
Example: an index trades between 4,900 and 4,950 for eight sessions. Buying near 4,905 and selling near 4,945 works until the day it does not, which is why a stop outside the range is essential.
Related: support, resistance, breakout, chop, mean-reversion