What is TPP

The Trans-Pacific Partnership (TPP) is a proposed regional regulatory and investment treaty. As of 2014, twelve countries throughout the Asia Pacific region have participated in negotiations on the TPP: Australia, Brunei, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore, the United States, and Vietnam.
The proposed agreement began in 2005 as the Trans-Pacific Strategic Economic Partnership Agreement (TPSEP or P4). Participating countries set the goal of wrapping up negotiations in 2012, but contentious issues such as agriculture, intellectual property, and services and investments have caused negotiations to continue into the present, with the last round meeting in Ottawa from 3–12 July 2014. Implementation of the TPP is one of the primary goals of the trade agenda of the Obama administration in the United States of America.

*From WikiPedia, which for purpose is suitable enough

 https://en.wikipedia.org/wiki/Trans-Pacific_Partnership