Time-series Sales forecasting is one of the most important topics in every business, helping to process data taken over a long period of time. Stock exchange, logistics, retail are classic industries where the ability to build predictive models becomes a crucial differentiator in a highly-competitive business environment. In our article we’ll try to explain how time series analysis and sales forecasting methods can be used for typical business tasks: finding hidden patterns, detecting trends in sales over the years, and predicting sales in the future.