Imbalance (disorder) in financial markets means that either the buyer or the seller side dominates the trade, indicating a discrepancy between supply and demand.

The existence of imbalance drives price movement. Additionally, even the smallest price change is a reflection of imbalance.
When at the current position on the price chart, the number of buy or sell orders exceeds the order volume of the opposing side (which is the essence of imbalance), they will be executed through the opposing orders at the next price level.
The price then begins to shift.
This situation will continue until the supply and demand are balanced again at an equilibrium point.