What is this indicator?
Shows the volume traded at each price level (rather than each time period) and highlights high-activity zones. The zone with the highest volume (the POC) often acts as a strong support/resistance level.
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.