In NBA betting, A "Total" or "Over Under" bet is a wager on the total amount of points in a given contest from both teams combined.
With a total you will either be betting "over" which means you think the total points exceed the line or "under" which means you think the combined score will be less than the number posted
Hawks vs Suns Total of 230. Final Score ATL 130 PHO 111. In this NBA betting example, the total line was 230 points which means you are wagering if the combined score will be over or under that number. With 241 total points in this game the Over bettors would win this wager