Number of columns in Excel 2007+:

In Excel 2007 and later versions, the number of columns available on a single worksheet significantly increased to 16,384. These columns are labeled from A to XFD, with XFD being the last column.

• 256 was the maximum number of columns in older Excel versions (Excel 2003 and earlier), making it incorrect for Excel 2007+.
• 65,536 was the maximum number of rows in Excel 2003 and earlier, not columns.
• 1,048,576 is the maximum number of rows in Excel 2007 and later, not columns. Understanding these dimensions is crucial for managing large datasets in modern Excel.