Question: Why would one take the first-difference of a time series - i.e., what the I in ARIMA? Please help me understand as well as what

Why would one take the first-difference of a time series - i.e., what the "I" in ARIMA?

Please help me understand as well as what type of resources such as articles, websites or books, you found this information and I could find more information on this topic.

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