Basically a sheet is a blank canvas on which you can drop tables or charts or other things.

You can see on the left the list of the sheets, and within the list of the objects they contain.

It has all sorts of benefits over Excel's one grid approach:

- You can display two tables, one above the other, and the first can overflow without pushing the bottom table off-screen

- You can display two tables, one above the other, and the columns do not have to be aligned / have the same width (I am sure everyone using excel ran into this problem), same thing for row height for side by side tables.

- If these tables contain data, it allows to separate logically data on the same sheet instead of relying on empty columns as a convention. You can then filter the two tables independently but have both always visible on the same sheet

- Makes more sense for positioning charts vs tables

- Preserves the full flexibility of a generic excel grid, i.e. one object could be a table containing data, the other could be some complex calculation, etc. Excel has some ways to present data in a similar way but at this stage it is just summary data, not a generic spreadsheet