In Excel, the cell type for most of the stuff you type is set to General by default. What does this General mean? This means that the content within the cell is generic and has not been identified as a number, some text, or a date. Depending upon what you are doing with the Excel sheet, it may really not matter if Excel just treats the cell content as General. However, your Excel content may be used to create a chart in PowerPoint, and the chart data may contain some labels that are all digits with no alphabets.