Every mobile application is composed of various components such as a login, dashboard, my profile, about page and many others. These components are basically the building-blocks of your app.
For the Ionic Framework, we call these building blocks as Pages.
You can design your page in the HTML file by using the usual markups and with the Ionic view components.
These files will be processed by Ionic and will transformed by Apache Cordova to a Windows Mobile, iOS or an Android project. The Ionic Pages will be rendered as a Web View by the Mobile Operating System, along with the other Cordova and Ionic plugins.