All U.S. citizens need a valid passport as well as a valid Indian visa or an Overseas Citizen of India (OCI) card, to enter and exit India for any purpose. Travelers without valid documents or the correct type of visa may be denied entry into India.
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If you want to spend some time in India, you must check the travel documents you need for your visit. The India Tourist eVisa is available for foreign travelers who want to visit India for tourism. On the other hand, the OCI Card allows you to live and work in India.
Maximum stay by a foreigner in India on an e-Tourist visa or regular paper Tourist visa or both in one calendar year shall be restricted to 180 days. Foreign nationals will not be allowed to enter India through land routes on e-Tourist Visa/regular paper Tourist Visa.