Trading based on money flows
Money flow is calculated by averaging the high, low, and closing prices, and multiplying by the daily volume. Comparing that result with the number for the previous day tells you whether money flow was positive or negative for the current day.
It is based on FII Inflows, DII flows in and out of stocks, Open Interest analysis, promoter deals, stake sales, gross delivery data, Index rebalancing etc. More often, than not, this data is vital to identify the near term trends in the stock market. Many professional traders give such information first priority and then back it up by technical analysis of stocks and indices.