What happens when we are not prepared for an Interview or give interview casually???

What happens when you are not prepared for an Interview or give the interview casually??
I have been wanting to ask this question many times but out of utter embarresment was unable to but now finally took up courage to ask about it??
Anyone in this field can help me?? Opinions are requested to some article as I'm in 3rd year from Tier 3 college it haunts me when I think myself without a proper job.
So please help me in this.
Vried opinions are most welcome. (SimletFace! SmileyFace)

PeaceOut!!!!

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