What advantages do electronic spreadsheets have over paper spreadsheets?

Data can be added to or removed from an electronic spreadsheet whenever the user wishes to do so. A press on a keyboard button will update the spreadsheet. On a paper spreadsheet, this would not be possible. Any data that needed to be added or erased would usually mean gluing a blank label over the cell, and writing in the new data, or using a liquid paper correction fluid to mask the cell and writing over the top with a pen (messy). Using an electronic spreadsheet means you could sort, rearrange, produce reports, produce graphs, and so on - which would be very time consuming using a paper, database card system.