What is this indicator?
Estimates the flow of money in and out by analyzing the relationship between volume and price movement over short and long periods. Its divergence with price is one of the well-known signals for a trend change.
How to read the chart
A rise happening alongside price movement confirms that move's validity; a divergence between volume and price is often a sign of a weakening trend.
Practical tip
Always check volume alongside price movement; volume on its own, without regard to the price trend, isn't a reliable signal.