It is VWAP - worth a quick study to begin to understand.   https://www.investopedia.com/terms/v/vwap.asp 

I often reflect on this bit:

Institutional buyers including mutual fundsuse VWAP to help move into or out of stocks with as small of a market impact as possible. Therefore, when they can, institutions will try to buy below the VWAP, or sell above it. This way their actions push the price back toward the average, instead of away from it.

Which means that when price is stretched from VWAP, the likelihood of a reversion to mean (in this case VWAP) is higher than not - can be useful for timing entry/exits intraday.  Intra-day,  bears repeating.

it is a common indicator that you can add to your charts on whatever platform you use.  Tradingview will only show it on intraday time frames.