How do recommendations work on the common app?

<p>I'm a bit confused about recommendations on the common app.
Do the teachers actually submit their recs online to colleges or are they just saved in my account?
(So that I can submit whenever I want?)
I also heard that snail mail is better for submitting recs. Is this true?</p>

<p>Thanks.</p>

<p>Teachers are e-mailed a logon and they can work on their reccomendation online as part of your application. It’s confidential, you don’t get to see it unless they show you, and it will be submitted with your app.</p>

<p>Will these recommendations be automatically placed on the supplements that require them?</p>