1. The total number of options and/or futures contracts 
that are not closed or delivered on a particular day.

2. The number of buy market orders before the stock market 
opens.

1. A common misconception is that open interest is the same 
thing as volume of options and futures trades. This is not 
correct as demonstrated in the following example:



On Jan 1, A buys an option, which leaves an open interest 
and also creates trading volume of 1.
On Jan 2, C and D create trading volume of 5 and there are 
also 5 more options left open.
On Jan 3, A takes an offsetting position and therefore open 
interest is reduced by 1, and trading volume is 1.
On Jan 4, E simply replaces C and therefore open interest 
does not change, trading volume increases by 5.

question:- Defination of Book keeping:-
answer :- Book keeping is a syntific method to record day 
to day business transaction in words & in figures so as to 
show the correctly & clear financial position of business.