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Difference between SharePoint hosted, Autohosted apps and SharePoint hosted apps
The following image can give you an overview of the entire app schema:
Following you can read the definition for each type of hosted app:
SharePoint hosted app
SharePoint-hosted apps, or apps where all components are hosted on either an on-premises or Office 365 SharePoint farm. SharePoint-hosted apps are installed on a SharePoint 2013 website, called the host web. They have their resources hosted on an isolated subsite of a host web, called the app web. It’s important to know the difference between host webs and app webs. .
Provider hosted apps
Provider-hosted apps for SharePoint include components that are deployed and hosted outside the SharePoint farm. They are installed to the host web, but their remote components are hosted on another server.
Autohosted apps
Autohosted apps for SharePoint are cloud-hosted apps whose remote components are provisioned and deployed for you on Windows Azure. As with a provider-hosted app, an autohosted app for SharePoint can interact with a SharePoint website but also uses resources and services that are located on a remote site that is hosted by Windows Azure. The SharePoint 2013 installation provisions and deploys these resources for you.
The main difference is that with auto-hosted apps all Windows Azure and Windows Azure SQL Database components are provisioned for you when the app is installed and the Windows Azure Web Sites infrastructure handles load balancing and other important maintenance tasks for you.
When using provider-hosted apps, you’re responsible for provisioning what’s necessary to support the app.
For more information, please: http://msdn.microsoft.com/en-us/library/office/fp179887(v=office.15).aspx