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I was intrigued by the question as I didn't know the answer. (In fact, I didn't even understand the question ... turns out its about logistics.)
1PL - you handle your own logistics
2PL- you send stuff through the mail
3PL - somebody else sends stuff through the mail for you
4PL - somebody else does everything for you, you just tell them what to do
This is the best page I found:-
http://www.globallogisticsmedia.com/articles/view/3pl-vs-4pl-and-why-everyones-getting-all-confused-about-it
