How stock prices decided???

In the National Stock Exchange site (www.nseindia.com) if I check the quote of some stock, it displays a table "Price Information" and a table "Order Book".

Attached a snapshot.

I dont understand how the "Last Price" is decided. Can someone explain?


Price Information
Open 81.90
High 83.45
Low 80.85
Last Price 82.75
Prev. Close 80.75
Change 2.00
% Change 2.48
Average Price 82.19
Total traded quantity 29427807
Turnover in Rs.Lakhs 24186.71


Order Book
Buy Qty Buy Price Sell Price Sell Qty
302 82.65 82.70 50
18567 82.60 82.75 335
19354 82.55 82.80 16159
17872 82.50 82.85 16615
200 82.45 82.90 28568
1238029 Total Buy Qty Total Sell Qty 4120803


Thanks!

Last price is the last price the stock was traded at, so it isnt decided. It is what it is.

Ya, I got your point but I do not understand the order book table that nse stock quote shows.
It shows buy qty, buy price and sell price, sell qty.

Is there some relation between the buy price, sell price as shown in the order book and the last traded price?

Sorry, may be my question is very basic.

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