Oolong tea is nothing more than the leaves of the camellia sinensis that have been processed a certain way. It is one of the four types of teas ( white , green , oolong, and black ).
Oolong teas are the most difficult of the four types of teas to process. The best way to describe oolong tea is that they are somewhere in between green and black tea. This is because they are only partially oxidized during the processing.