Debian Porterbox machine

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Newsgroups gmane.linux.debian.ports.amd64
Message-ID <[email protected]>
Hi all.
I am new to Debian. I am reading the debian machines and I see,  
porterbox machine and buildd machine. what is the difference between  
these two machines?
The buildd machines by the aim of sbuild tries to build packages for  
every supported architecture, but what does porterBox machines? I  
don't know that!!!
please help me.
Thanks.
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