A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
When you enter =A1:A5 into any cell in rows 1 to 5, you will get the value from column A, from the same row where you entered that formula - unless you array enter it, in which case you will get 1, which is the first element of the array, returned to the first cell into which the formula is entered.
If you select 5 cells instead of one cells - say B101:B105, and enter using Ctrl-Shift-Enter - the formula (=A1:A5) will return 1,2,3,4,5. You can enter that formula into between 1 and n cells - if you used 2 cells, you would get 1 and 2 - if you use more than 5 cells you will get #N/A in the cells 6 and on.
The formula type =A1:A5 is really meant for tables, to make sure that you get the value from the same row, and really should be entered as =$A$1:$A$5 so that it does not update to A2:A6, etc.