Foreign investors have two main options for investing in India: directly setting up operations through a branch, liaison, or project office, or establishing an Indian subsidiary. Setting up a subsidiary is generally advisable for larger investments. Liaison offices are limited as they cannot earn income, while project offices can only operate for the duration of a specific project. Branch offices allow for more business activities and profit repatriation but cannot do manufacturing. Establishing a wholly-owned subsidiary provides benefits like full foreign ownership and incorporation under Indian law. Joint ventures are also popular and allow sharing of markets, intellectual property, and risks.