Sure! Basically, certain formulas in excel affect more than one cell. For example, there is a function called “sequence”. “=SEQUENCE(5)” puts a 1 in the cell where it is, a 2 in the cell below, 3 below that etc. up to 5. I.e. it “spills” out of its cell.

I mostly use this feature when A) designing spreadsheets where I need to update the number of rows of data during operation, or where the number of rows is truly dynamic (a real example is a sheet that goes through my asset purchases and bundles them into buy-sell chunks for tax) B) Where I want to do anything with filters that excel doesn’t have by default - since one of the spill-enabled functions is “FILTER”

I know the ‘right’ way to perform these tasks is with an actual programming language but I want to be able to share these sheets with others and have them be vaguely happy to have them.

I just need spill ranges from excel before I can fully ditch the microsoft office suite, so many of my spreadsheets rely on them.