The Trans-Pacific Partnership (TPP) agreement is a multilateral trade pact signed by 12 countries bordering the Pacific Ocean. The countries involved in the TPP account for around 40% of the world`s GDP, highlighting the importance of the agreement.

The TPP agreement aims to promote economic integration and free trade among its members. It was signed on February 4, 2016, after years of negotiations and has been in effect since December 30, 2018.

So, who is in the TPP agreement? The countries involved are:

1. Australia: A western country with a population of around 25 million. It has a strong economy and is known for its exports of minerals and natural resources.

2. Brunei Darussalam: A small, oil-rich country in Southeast Asia.

3. Canada: A North American country with a population of around 38 million. It is known for its vast natural resources, including oil, gas, and timber.

4. Chile: A South American country with a population of around 19 million. It has a diverse economy, with significant exports of copper, fruit, and fish.

5. Japan: A major economic power, Japan has a population of around 126 million. It is known for its advanced technology, manufacturing, and automotive industries.

6. Malaysia: A Southeast Asian country with a population of around 32 million. It has a diverse economy, with significant exports of petroleum, electronics, and palm oil.

7. Mexico: A North American country with a population of around 126 million. It is known for its exports of petroleum, automotive, and electronics products.

8. New Zealand: A small island country in the South Pacific with a population of around 5 million. It is known for its exports of dairy products, wool, and meat.

9. Peru: A South American country with a population of around 32 million. It has a diverse economy, with significant exports of copper, gold, and silver.

10. Singapore: A small, wealthy island nation in Southeast Asia known for its export-oriented economy and advanced technology industries.

11. Vietnam: A Southeast Asian country with a population of around 97 million. It has a rapidly growing economy and is known for its exports of textiles, electronics, and agricultural products.

12. United States: A North American country with a population of around 330 million. It is known for its advanced technology, aerospace, and automotive industries.

In conclusion, the TPP agreement involves 12 countries that border the Pacific Ocean. These countries have diverse economies and are known for their significant exports of natural resources, electronics, and advanced technology products. The agreement aims to promote economic integration and free trade among its members, highlighting the importance of international cooperation in today`s globalized world.