What is volume in stock market
Trading volume can give you a lot of information about price movement if followed properly.
* If price go up with increase in volume, prics are likely to increase more.
* If price go down with increase in volume, it is likely to go down further.
* If price go up without increase in volume, it may come down any time.
* Similarly if prices go down without any volume, it may bounce back.
* There are many other theories attached to volume and it mostly help one to decide short term trading direction for market but it's not fail safe.
Hope this helps