This is very basic query…There is NO change in my view..You are confusing bid and offer quantity with the volume. Both are TOTALLY Different from each other.
Bid and Offer quantity is an intent of a buyer or seller to buy or sell a stock whereas volume is the actual traded quantity i.e. no of trades executed. A bid or offer qty might be 1 Cr each but actual volume might be only 1 lac. It is not necessary that all the bid or offer quantity will convert into volume.
Also, i request you not to post any basic queries in this forum. This forum is only for Serious Learners.