what is the difference between removing and hiding rows

Hi Elmo22 

I suppose you mean what's the difference between filtering or removing rows, isn't it?

Then, filtering is useful when you want to remove rows based on the values of a specific column/columns. Imagine you are reading an Excel file and you decide to remove two last rows because it has empty values. But later on, when someone adds information there's no blank cells at the end. The last two rows will be deleted anyway. Instead, if you had filtered, rows wouldn't have been deleted. 

You can read more in this link: https://blog.westmorr.com/2018/10/02/power-bi-remove-rows-or-column-filter/