The document discusses how hotels can improve demand forecasting through the use of big data. It outlines seven key types of data that can be analyzed: 1) historical booking data, 2) competitor pricing, 3) events and macroeconomic factors, 4) air traffic data, 5) social reviews and ratings, 6) weather data, and 7) web shopping behavior data. When these various data sources are combined and analyzed, it allows hotels to generate highly accurate forecasts that can optimize pricing and drive greater profits.