What is Duckworth-Lewis method in cricket?

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The Duckworth-Lewis method is a way to calculate the target score for the team batting second in one day international cricket match interupted by weather or other circumstances. It is generally accepted to be a fair and accurate method of assessing the target score; however, as it attempted to predict what "would have happened" had the game come to its natural conclusion, it invariably generates some controversy. A simple example of the DL method being first applied was the first One day international between India and Pakistan in their five match ODI series in pakistan. India batted first and were all out in the 49th over for 328. Pakistan, batted second, were 7 wickets down for 311 when bad light stopped the game after the 47th over. This is relatively uncontroversial example, because with three full overs left to play and three wickets in hand. most cricket fans would agree that Pakistan would be favored to easily close the 17 run gap and take the match. In fact, the application of DL method showed that at the end of 47th over, the par score was 304, so the official result of the match was that "Pakistan won by 7 runs"