which forecasting model is used in forecast() in forecast package in R? -

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i used forecast() forecast package in r forecast marks of school student. assumed time series of marks frequency of 4 i.e. quarterly 4 years. results good. want know forecasting model being used in function have little knowledge of statistics , difficult me identify suitable model predicting student's marks. kind of appreciated. thank you.

please read files. here excerpt help(forecast):

the function forecast.ts makes forecasts using ets models (if data non-seasonal or seasonal period 12 or less) or stlf (if seasonal period 13 or more).


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