The principal objective of the OPEC (Organization of the Petroleum Exporting Countries) is to harmonize the oil policies of its member countries. This means that OPEC aims to coordinate and align the production and export of oil among its member countries to ensure stability and sustainability in the global oil market. OPEC seeks to achieve this goal by conducting regular meetings, negotiations, and agreements among its member countries. While OPEC may impact oil prices in the international market, its primary objective is to ensure stability and sustainability in the oil market by harmonizing the policies of its member countries.