Facebook - Confusion between facebook page and facebook app

Question

I want to create an app in facebook. But I have little confusion about facebook pages and app. I created canvas app in facbook using localhost setup and it works fine for me.

Question 1: My question is top bar with like button comes in facebook app or facebook page.(Image included of some random app)

I'm also curious to know whether http://www.facebook.com/americaneagle/app_153839431317646 is facebook app or page.Because it is not in domain "app.facebook.com" and works like app (Not only this there are some other app/page which looks like webpage inside iframe )

If this is an app how to setup topbar with like in myapp

Question 2:

I was referring Sephora (Just random app,nothing to do with this app) which allow user to see content only after we like that app which also not in "app.facebook.com" domain.

Can we implement same thing in app (app.facebook.com/app_name).

I got one solution. Is there any other way?

Answer 1

You clearly got confused between an app and a page tab.

A Facebook app is simply the app that you see with the domain apps.facebook.com, whereas a page tab is an app which is used in the context of the page and comes as www.facebook.com/page/appnumber.

You can find out more about page tabs here and implement it easily. Also here's a link about Facebook apps.