What are the differences between using an Excel workbook in Excel Online and Excel desktop?

Differences between Excel Online and Excel

Microsoft provides a list of feature and function differences between the Excel Online and Excel desktop here:

https://support.office.com/en-us/article/Differences-between-using-a-workbook-in-the-browser-and-in-Excel-f0dc28ed-b85d-4e1d-be6d-5878005db3b6