What exactly does the do no disturb setting on the iPhone do?

I recently update my phone to the iOS6 and I really wanna know what it does

Press it

When you receive notifications, texts, emails and calls, it will not notify you. You will still get them but it will prevent your screen from lighting up!

I find it useless, i used it last night on my iphone 5 but it didn't even work, i still got notified by phone calls and text messages.

When it's active, your phone won't emit alerts for notifications and calls. It will only alert for calls if it it's turned on in settings and you receive 2 calls from the same person or from important contacts.

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