Please explain volume as teaching it to a layman

Hi everyone,
I was unable to understand volume can anyone explain me volume and how to use volume while trading or investing.
I’m attaching a screenshot please explain how to interpret the volume bars and the top variables in the image
the numbers beside volume text top left… sometimes they are green and red at same time what does it mean and how to interpret it.


Thanks in advance.

You can read this chapter on Varsity to know about Volumes:

I did that earlier but there is no explanation of how to interpret the bar and those 10.147M 10.506M from my screenshot attached

The 10.147M is the average traded volume for given period, this will be based on moving average, you can check the Volume indicator settings to check MA period.

The 10.506M is traded volume for that specific period, this tells you the shares bought and sold for that period.