Final answer:
The tabs at the bottom of a worksheet are known as sheet tabs, which help navigate between different worksheets within a workbook.
Step-by-step explanation:
The tabs that appear at the bottom of each worksheet in spreadsheet software like Microsoft Excel or G Sheets are known as sheet tabs or worksheet tabs. They help users navigate between different worksheets within a single workbook. Each tab usually displays the name of the worksheet, and clicking on a tab will bring that worksheet into view. Worksheets can be renamed by double-clicking on the sheet tab and typing in the new name. Additionally, you can usually reorder, add, or delete worksheets using options in the same area.