Man greeting Man - Light handshakes are common after the initial "Namaste".  Sometimes the Namaste alone will suffice.

Woman greeting Woman - Light handshakes are common after the initial "Namaste".  Sometimes the Namaste alone will suffice.

Greetings between Men & Women - In formal and business situations it is usually best to let the women initiate contact, if at all.  Many Indian women will avoid contact with men in public situations.  The "Namaste" is the most common form of greeting.

Note: Most all meetings generally begin with palms pressed together at around chest level and saying, “Namaste” or “Namaskar” (which is more formal).  People usually nod or bow slightly as well.

When greeting an elder, there is also a touching of the feet of the elder, with the right hand, then touching your chest.  After this, is the palms pressed together. Foreigners are not expected to do this, but should when meeting those of extremely high status like a religious leader or guru.  

Hugs and kisses as a form of greeting should be avoided.