The Safe Bet
Namaste (hands pressed together at chest level, slight bow) is the safest, most
respectful greeting for any age or gender.
Handshakes: Common in business settings. However, some traditional women may
prefer Namaste over touching a stranger's hand. Let them initiate the handshake first.
Respecting Elders
If you meet someone significantly older, Namaste is preferred. You might see younger Indians touching the feet of elders—this is a sign of deep respect/blessing ("Charan Sparsh"). As a foreigner, you are not expected to do this, but acknowledging it is good.
"Hello" Works Too!
English is widely spoken. A simple smile and a "Hello" or "Good Morning" works 99% of the time in urban India.