Export of data is provided mainly for summaries and statements like Trial Balance, Stock Summary, and so on. The main use would be to export data to, for example, a spreadsheet, and reorganise it for statutory presentation, or export it to another company that is using Tally for direct import.
Export of all reports and statements is possible. A separate button E: Export is provided in the button bar. You can press Alt+E (Export) to export the current report. There are various formats available for export.
The exported file is saved in the parent Tally directory on your computer. You can now use that file to import its contents into another program, send it as it is (say if it is HTML file) to a colleague or view it using a browser.