Forecasting is a method or a technique for estimating future aspects of a business or the operation. It is a method for translating past data or experience into estimates of the future. Forecasting done over time is time series forecasting.
Time series forecasting is very useful for businesses in sales prediction and other predictions over time
Article 1 : https://medium.com/@sangarshananveera/time-series-forecasting-part-1-d523bcc3acbf
Article 2: https://towardsdatascience.com/time-series-forecasting-arima-models-7f221e9eee06