I can mention following points, but there can be several reasons to use PowerPoint:

1. Leaders/ Managers use PPT to present management communications to the team in a sequential and interesting way
2. Business/Official presentations
3. School/Educational presentations
4. Presenting new ideas or projects
5. Video makers use PPT to convert presentations into MP4 videos and use the video for business promotions on website, social media, etc.
6. PPT also has feature to create photo albums. You can create nice collages as well using PPT
7. You can create nice thumbnails for your You Tube videos using PowerPoint
8. You can create nice slide designs using 'design ideas' feature of PowerPoint
9. You can create 3D animations

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