What is the Google Sheets application, how does it work?

According to the introduction of Google LLC, Google Sheets is a Productivity app on the Android platform. There is currently a 1.20.102.07.40 version released on Mar 12, 2020, you can see the details below.

Create, edit and collaborate with others on spreadsheets from your Android phone or tablet with the Google Sheets app. With Sheets, you can:

- Create new spreadsheets or edit existing files
- Share spreadsheets and collaborate in the same spreadsheet at the same time.
- Work anywhere, anytime - even offline
- Add and respond to comments.
- Format cells, enter or sort data, view charts, insert formulas, use find/replace and more.
- Never worry about losing your work – everything is saved automatically as you type.
- Get insights, instantly, quickly insert charts and apply formatting in one tap - with Explore.
- Open, edit and save Excel files.

Permissions Notice
Contacts:  This is used to give suggestions of people to add to files and share with.
Storage:  This is used to save and open files on USB or SD storage.