An active worksheet is the worksheet that is currently open. For example, in the picture above, the sheet tabs at the bottom of the window show "Sheet1", "Sheet2", and "Sheet3", with Sheet1 being the active worksheet. The active tab usually has a white background behind the tab name.
Common word processing programs such as Microsoft Word and Google Docs include a set of commands for creating blank tables, entering data in tabular format and adjusting the overall appearance of the table. The overall size of the table, in terms of the number of rows and columns, is typically constrained by the size of the printed page on which the table will appear. Word processors can also carry out simple commands such as finding the sum of all numbers in an individual column.