SharePoint 2013 - "Sorry, apps are turned off. If you know who runs the server, tell them to enable apps" when trying to add Apps

while adding apps to share point site, you need to configure the apps for share point server manually. 
we need to follow the actions below,

• Configure the App site collection 
• Configure the App domain
• Configure an account for apps
• finally if you are having host header for that web application, you need to create a new web application.

following are the blog articles that explain clearly configuring the apps to share point.

http://sharepointchick.com/archive/2012/07/29/setting-up-your-app-domain-for-sharepoint-2013.aspx

http://blogs.technet.com/b/harmeetw/archive/2013/01/03/sharepoint-2013-you-receive-quot-sorry-apps-are-turned-off-if-you-know-who-runs-the-server-tell-them-to-enable-apps-quot-when-trying-to-add-apps-on-host-header-site-collection.aspx

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Suresh Pydi