International investment law is a branch of international law that governs foreign direct investment (FDI) and the rights and obligations of states and foreign investors in relation to FDI. It encompasses a set of rules and principles that regulate the entry, operation, and treatment of foreign investments in a host state, as well as the resolution of disputes that may arise between states and investors. The main objectives of international investment law are to promote and protect foreign investments, create a predictable and transparent investment environment, and resolve disputes in a fair and efficient manner. This area of law is often governed by bilateral investment treaties (BITs), regional trade agreements, and multilateral treaties such as the International Centre for Settlement of Investment Disputes (ICSID) Convention. International investment law covers a wide range of topics, including the treatment of foreign investors, expropriation of investments, financial regulation, and dispute settlement mechanisms. It is a rapidly evolving field that is increasingly interconnected with other areas of international law, such as human rights, environmental law, and trade law.