What is OpenOffice Calc

OpenOffice Calc is the spreadsheet part of the OpenOffice software package.
 Calc is similar to Microsoft Excel,with almost the same abilities. Calc is capable of opening and saving spreadsheets in Microsoft Excel's file format. It provides a number of features not present in Excel, including a system which automatically defines a series for graphing based on the layout of the user's data. Calc is also capable of writing spreadsheets directly as PDF files.
Calc can store a maximum of 65,536 rows with 1024 columns in each sheet, with a maximum of 256 sheets.There is a way to increase these limits, but it is only suitable for ODF and text-based formats, as there is a risk of data turning unusable for binary formats such as Microsoft Excel's file format.