What is a Flexible Page?

Flexible Pages occupy a middle ground between page layouts and Visualforce pages. Like a page layout, Flexible Pages allow you to add custom items to a page. However, they don’t have the same structure as a page layout, and the custom items are all components.

You can use a Flexible Page to create a home page for a third-party app that you can then add directly into the Salesforce1 mobile navigation. This provides your Salesforce users with a mobile home page that lets them quickly access the objects and items that are most important in that app.

You can also assign global actions to a Flexible Page by specifying them in the Flexible Page XML. When users tap from a Flexible Page, any global actions that you’ve assigned to it will show up in the publisher.