An E-2 petition refers to the application process for obtaining an E-2 Treaty Investor Visa in the United States. The E-2 visa is available to individuals from countries that have a qualifying treaty with the U.S. It allows foreign nationals who are making a substantial investment in a U.S. enterprise to enter the U.S. for the purpose of developing and managing that investment. The E-2 visa can be applied for by investors, employees of the investor's enterprise, or the enterprise itself. The petition involves demonstrating the substantiality of the investment and meeting other eligibility criteria as outlined by U.S. immigration laws and regulations