What is the difference between bid quantity and offer quantity in stock market?

We all know that fluctuation of stock price is due to tug of war between supply and demand. When you check a quote of a stock, you can find info on "Total Bid Quantity" and "Total Offer Quantity".

"Total Bid Quantity" (TBQ) is the current no of buy order quantity in the system or in other words Demand. "Total Offer Quantity" (TOQ) is the current no of sell order quantity in the system or in other words Supply.

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(Source : https://www.quora.com/What-is-the-difference-between-bid-quantity-and-offer-quantity-in-stock-market)