This document defines foreign direct investment and outlines some of the main theories, forms, strategies, and costs/benefits associated with FDI. It defines FDI as long-term investments involving control or influence over management. The key theories discussed are the MacDougall-Kemp hypothesis of capital moving from abundant to scarce economies, and industrial organization and location-specific theories. The main forms are greenfield investment, mergers and acquisitions, and brownfield investment. Strategies include firm-specific advantages and lowering costs. Benefits are factors of production, economic growth, and balance of payments, while costs include cultural influence and resource overuse.