Confused

Hi @JdR,

Hope you are doing well. Per the description, I understand that you want to know the usage of the application.

Installing the applications depend upon your usage. If the requirement for you is to view and edit PDFs, you can only keep Acrobat Reader Mobile. 

If you need to scan files using your camera and convert and add comments to them, you might want to install Adobe Scan.

If the only requirement is to fill out online forms and add signatures, you might install Adobe Fill & Sign.

For mobile, there are no separate Acrobat and Acrobat Pro, but Acrobat Reader Mobile comes with a mobile-based Acrobat Premium subscription for using more Premium Features.

You may refer to the FAQ page for more: FAQ | Adobe Acrobat Reader mobile app

Hope this helps.

-Souvik.

Typo - five *different apps