Google Now confusion

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http://forums.androidcentral.com – A few days ago, I received my GS4 in the mail. It's been great so far but one thing confuses me. It's probably a noob problem but here it goes, On my phone there's a Google app that, when opened, takes me to, what I believe to be, Google Now. On the home screen when I touch and hold the menu button, I am taken too, what I again believe, is the general Google search. But the "general Google search" also has cards. Adding to the confusion is the fact that the Google app is actually called "Google Search". Can someone explain this to me? (HowTos)