VWAP purchase with institutional

Volume Weighted Average Price (VWAP) is a measure that represents the weighted average price at which you trade
of a given time span on a given title have taken place. The measure is used in particular by institutional investors
as a reference for the execution of a sale and purchase operation articulated on several exchanges. The vwap and its upper and lower standard deviations represent supports and resistances (with particular emphasis on the second band).

On a day in range, strong hands like to buy on weakness (second band) and sell on strength (vwap), the price will bounce between vwap and bands. On a trending day the price will break out of the bands.
The same concept can be applied on longer time frames hence the need to have an indicator on a weekly / monthly / composite basis.