Volume Delta

Volume Delta represents the difference between the pressure exerted by buyers and sellers in the market. It is calculated by subtracting the volume traded at the bid price from the volume traded at the ask price.

The Volume Delta indicator presents the cumulative number of transactions taking place on both bid and ask within a specified time frame. It shows the absolute value of the net difference between bid and ask volumes. The color, whether green for bid volume or red for ask volume, represents the higher value and is displayed in relation to the total volume.

Volume Delta oscillates around zero.
A Delta value of zero indicates that the buying and selling pressures are balanced within the given candle.
A positive Delta indicates a larger volume of aggressive buying at the ask price resulting from trades executed by assertive buyers.
Conversely, a negative Delta signifies a higher volume of aggressive selling at the bid price resulting from trades executed by assertive sellers.  

In TabTrader, the Volume Delta is utilized in additional tools, such as Cumulative Delta and Volume Delta + Volume. 

Formula

Bid/Ask Volume = Number of transactions at the bid and the ask

Bid/Ask Volume Actual = Number of assets traded at the bid (BVol) and the ask (AVol)

Additional display line = | BVol - AVol |, color represents whichever is greater (BVol or AVol)