CSI (Container Security Initiative) is a program implemented by the U.S. Customs and Border Protection (CBP) in partnership with foreign governments and the maritime industry to enhance the security of containerized cargo entering the United States. Under the CSI program, CBP deploys personnel to work with foreign authorities at select ports around the world to target and inspect high-risk containers before they are shipped to the U.S. This collaborative effort aims to prevent the introduction of terrorist weapons or materials into the supply chain and ensure the safety and security of international trade.