A typical volume histogram at the bottom of the chart shows you the volume at a particular time on the chart. In your example the chart is a minute chart, so the volume chart based on where you hover shows how many contracts were traded in that particular minute.
But what is probably more meaningful to know is the volume that traded at a particular price. Knowing this is helpful in making trading decisions. Kite, the web based app of Zerodha comes with an indicator called Volume profile that helps you in the same. This is the pink horizontal bars that you are seeing on the right.
Volume profile shows you the total volume at a particular price on the chart that is open. Market moves on higher volumes are always more important than those on thin volumes. So for example in the chart above for an extremely short term intraday trader, the top made at 8244 came on very thin volume, so this would have been a good indication to not buy the breakout in price.
If you are a Zerodha client, you can get this indicator on our new trading platform kite.zerodha.com