What does polaris viewer tasks for samsung galaxy and other mobile phones?

Polaris Viewer helps you organize your files according to its type and/or folder.

It is also in-charged to view the file with the types like

Word
Excel 
PowerPoint
PDF

without this app, you won't be able to view that kind of files.

 Advantage of Polaris Viewer over simple My Files folder


Easy to locate a file.
For example you have a lot files and you are looking for a word file but you don't know what it's name and at what folder you placed it. In Poloris Viewer you can filter the result into 

Word files only
Sheet files only
Slide files only
PDF files only