Horizon is the next-generation editor in Sitecore Experience Platform. Horizon includes the following features:
The page editor, which you use to create and edit web pages. As you edit a page, you can see how it will appear on different devices.
Simulator mode, which you use to preview web pages as they will appear on different dates and on different devices.
Insights view, which you use to see analytics for your web pages.
After you install Horizon, the Horizon tile appears on the Sitecore Launchpad. When you click the Horizon tile, the Horizon module opens in page editor mode.