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The American Petroleum Institute, commonly referred to as API, is the main U.S trade association for the oil and natural gas industry, representing about 400 corporations involved in production, refinement, distribution, and many other aspects of the industry. The association’s chief functions on behalf of the industry include advocacy and negotiation with governmental, legal, and regulatory agencies; research into economic, toxicological, and environmental effects; establishment and certification of industry standards; and education outreach. API both funds and conducts research related to many aspects of the petroleum industry. . Different specifications exist for compression-ignited engines.

API provides vessel codes and standards for the design and fabrication of pressure vessels that help safeguard the lives of people and environments all over the world.

API also defines and drafts standards for measurement for manufactured products such as:

API has entered petroleum industry nomenclature in a number of areas:

Education outreach

In addition to training industry workers and conducting seminars, workshops, and conferences on public policy, API develops and distributes materials and curricula for schoolchildren and educators. The association also maintains a website, .

In the second half of 2008, as the US presidential election neared, API began airing a series of television ads where spokeswoman Brooke Alexander encourages people to visit their new website, API does not use their own name in the ads but does call themselves ''The People of America's Oil and Natural Gas Industry.''