Which file extension is for Excel?

The correct file extension for Microsoft Excel workbooks is .xlsx. This extension signifies that the file contains spreadsheet data, formulas, charts, and other elements managed by Excel. Understanding file extensions is crucial for identifying file types and ensuring they open with the appropriate software, facilitating efficient data management and organization within a computer system.

• .docx is incorrect because it is the standard file extension for Microsoft Word documents, indicating a word processing file containing text, images, and formatting.
• .pptx is incorrect as it is the standard file extension for Microsoft PowerPoint presentations, signifying a slide show file used for visual presentations.
• .txt is incorrect because it represents a plain text file. These files contain unformatted text and can be opened by almost any text editor, lacking the rich formatting and specialized features of Excel, Word, or PowerPoint files.