A spreadsheet is a digital tool used for organizing, analyzing, and storing data in tabular form. It allows users to perform calculations, create charts, and manage data efficiently.

• Microsoft Excel is a widely used spreadsheet software developed by Microsoft, available as part of the Microsoft Office suite.
• LibreOffice Calc is an open-source alternative to Excel, available in the LibreOffice suite.

Both Excel and Calc provide similar functionalities, including formulas, charts, pivot tables, and data management features. Therefore, spreadsheets are used in both Excel and Calc.