What does Chaikin Oscillator show?

The gap between a fast and a slow average of the Accumulation/Distribution line.

How is Chaikin Oscillator built?

A 3-period EMA of the A/D line minus a 10-period EMA of it.

Above zero: accumulation is speeding up. Below zero: distribution is speeding up. A divergence from price is a warning.

Volume

What it shows: The gap between a fast and a slow average of the Accumulation/Distribution line.
How it is built: A 3-period EMA of the A/D line minus a 10-period EMA of it.
How to use it: Above zero: accumulation is speeding up.
Below zero: distribution is speeding up.
A divergence from price is a warning.