What is Google Sheets and how does it compatible with Microsoft Excel?

Context: Google Sheets is a spreadsheet program included as part of the free, web-based Google Docs Editors suite offered by Google. Google Sheets is available as a web application, mobile app for: Android, iOS, Microsoft Windows, BlackBerry OS and as a 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 a user with a revision history presenting changes. An editor's position is highlighted with an editor-specific color and cursor and a permissions system regulates what users can do. Updates have introduced features using machine learning, including "Explore", offering answers based on natural language questions in a spreadsheet. This is one of the services provided by Google that also includes Google Docs, Google Slides, Google Drawings, Google Forms, Google Sites and Google Keep.

Answer: Google Sheets is a spreadsheet program included as part of the free, web-based Google Docs Editors suite offered by Google and is compatible with Microsoft Excel file formats (e.g., .XLS, .XLSX, .CSV, etc., . . .).