Nasdaq prints a new high at 19,340, and the RSI reading at that high is lower than the RSI reading at the prior swing high three candles back, even though price itself is clearly higher. Momentum and price have just disagreed, and that disagreement, divergence, is one of the more genuinely useful readings an oscillator offers, provided you know which of two very different things it might actually mean.
Regular divergence warns of exhaustion
Regular divergence is price making a new extreme while the oscillator fails to confirm it: a higher high in price against a lower high in RSI or MACD, or the reverse at a low. It suggests the move making the new price extreme is being carried by less underlying force than the move that produced the prior extreme, and it is the version most traders learn first. On EURUSD, a rally to 1.0920 that shows weaker RSI momentum than the earlier push to 1.0890 is a genuine caution flag: the buying is thinning even as price grinds higher. It is not a sell signal by itself. It is a reason to tighten a stop, take partial profit, or simply stop adding to a long, while waiting for price to actually confirm weakness with a real structure break.
Hidden divergence confirms trend strength
Hidden divergence runs the opposite way and means something closer to the opposite thing. Price makes a shallower pullback low than the prior one, while the oscillator makes a deeper low, and that pattern in an uptrend suggests the trend's underlying momentum is actually building even as the price pullback itself looks tame. On gold in an uptrend, a pullback to 2,415 that prints a deeper RSI low than the previous pullback to 2,408 is hidden bullish divergence, and it favors continuation, not reversal. Traders who see any divergence and assume it means reversal will misread this pattern badly and fade a trend that is, if anything, gathering strength.
Where divergence earns its keep, and where it does not
Divergence works best near an already-known level of resistance or support, where it adds a second, independent reason to expect a reaction rather than standing alone as the whole case for a trade. Regular bearish divergence at a fresh Nasdaq high with no nearby resistance is a much weaker signal than the identical divergence forming right at yesterday's high, where price already has a documented reason to struggle. Divergence in the middle of open air, far from any level, is easy to spot in hindsight and unreliable to trade in real time, because momentum can thin out for several bars before price actually turns, and a trader acting on the first sign of it alone is often early by a wide margin.
Reading it on the chart, step by step
Identify two comparable swing points in price, a recent high against the prior high, or a recent low against the prior low. Check the oscillator's reading at each of those same two points, not at some other candle nearby. Confirm the divergence lines up with a real level or an already-forming pattern, and treat it as one input toward tightening risk or watching for a confirming price structure, never as a standalone trigger to enter or exit on its own.