What is this indicator?
Shows how easily (on low or high volume) price is moving; a high reading means price is moving with low volume and ease. This indicator is mostly used to confirm the real strength of a trend.
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.