MT4 OBV and Volumes Indicator

Hi all

i have been doing some research and stumbled across the importance of OBV and Volumes (standard in MT4).

I noticed they tend to be used in stocks more but have seen applications where it is being used in Forex.

I currently have a OBV with a 13EMA over the top, set up on a weekly chart. I do have a Volumes indicator on as well. With the Volumes that is only going to give me a score in tick activity and i am only looking at a decrease or increase from previous?

I am still trying to understanding the technical importance of how these work but i do see some correlations in price action alignment with these indicators.

Please excuse my chart work - just tying to paint a picture.

Any ideas or suggestions or examples of this kind of thing in play would be great. Or if anyone can suggest someone to look up also.

Thanks,

what is OBV?