File extensions indicate the format or type of a file.

Common file extensions include:

1. .docx - Microsoft Word document
2. .pdf - Adobe Acrobat document
3. .jpg or .jpeg - JPEG image file
4. .png - PNG image file
5. .mp3 - MP3 audio file
6. .mp4 - MP4 video file
7. .xlsx - Microsoft Excel spreadsheet
8. .pptx - Microsoft PowerPoint presentation
9. .html - HTML webpage file
10. .txt - Plain text file

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What is a file extension