Google Sheets is a spreadsheet application and part of the free,  web application|web-based Google Docs Editors suite offered by Google.   Google Sheets is available as a web application; a mobile app for:  Android (operating system)|Android, iOS, and as a Application  software|desktop application on Google's ChromeOS. The app is compatible with Microsoft Excel file formats. 

The app allows users to create and edit files online while  collaborating with other users in real-time. Edits are tracked by which  user made them, along with a revision history. Where an editor is making  changes is highlighted with an editor-specific color and cursor.  A  permissions system regulates what users can do. Updates have introduced  features that use machine learning, including "Explore", which offers  answers based on Natural language processing|natural language questions  in the spreadsheet. 

Sheets is one of the Google Workspace|services  provided by Google that also includes Google Docs, Google Slides, Google  Drawings, Google Forms, Google Sites and Google Keep.

(Wikipedea)