Are Android folders Outbox, Inbox, Sent Box actual folders/categories in the ANdroid system?

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http://stackoverflow.com – I'm trying to get into android programming..but needed to know a few things to clear the road.. one of w/c is the message handling of android.. So when using an android phone you can see INBOX , OUTBOX, SEnt, Draft, etc are these real folders, or different tables in the android system? or same table w/ different category ID or something like that? What I wanted to do is manage my SMS messages through my App (preferably Phonegap package). I was assuming this is a simple sql query to android's sql lite? More importantly I wanted to be able to simply send sms by "putting" the said message in (HowTos)