How do you highlight an entire row in Excel?

To highlight an entire row in Excel, clicking on the row number on the left side is the correct approach. Each row in Excel is identified by a unique number, and when you click this number, the entire row is selected automatically. This method is effective for quickly selecting all cells in that row, allowing for various actions such as formatting, deleting, or applying functions to the entire row.

Other methods, like selecting the column header, only highlight that specific column rather than an entire row. Double-clicking within the row does not trigger a selection action; instead, it typically puts the cell into edit mode. While using the "Home" tab allows you to format a row, it does not inherently select the row; you still need to select it first to apply any formatting changes.