Final answer:
Clicking the sign in Excel expands or collapses a group of cells, making it easier to navigate and manage data.
Step-by-step explanation:
In Excel, clicking the '+' sign next to a group of cells expands or collapses them. This is useful when working with large sets of data that you want to hide or show selectively.
For example, if you have a spreadsheet with a group of rows or columns that you want to collapse, you can click the '+' sign to collapse them and make the spreadsheet easier to navigate. You can then click the '-' sign to expand them again.
This feature allows you to organize and manage your data more efficiently in Excel.