XLS files are spreadsheet files created by Microsoft Office Excel. An Excel spreadsheet can contain anything from images and plain text to graphs and tables and can be opened using Excel.

How to Read Excel Files on an iPad. The iPad has become a popular business tool for many different reasons, ranging from its ease of use to its security model to its support for business applications.

A CSV (comma-separated values) file is a text file in which information is separated by commas. CSV files are most commonly encountered in spreadsheets and databases. You can use a CSV file to ...