What does the currency button do when applied to selected cells?

When the currency button is applied to selected cells in a spreadsheet, it formats the content of those cells to represent monetary values. This includes adding a dollar sign in front of the number, which indicates that the value is in dollars. Additionally, it formats the number to display two decimal places, which is standard for representing cents in U.S. currency. Therefore, if you have the number 10, applying the currency format would change it to $10.00.

This formatting helps in making the data visually clearer and more professional, particularly when dealing with financial information. It provides the essential information at a glance, allowing users to easily identify monetary amounts.