Namaste over Hand shakeDifferent people greet differently. In India we greet with a Namaste-.
Namaste with hands folded and head slightly lowered. By joining the palms and bowing head,we honour the persons,whom we meet. It is kind of Mudra known as Anjali Mudra in Yoga.
It symbolises that every one is equal. We show our gratitude also.We welcome the person,who comes to meet us.In this way we also pay our gratitude to Supreme.
In Hand shake we have to make contact with other person. We donot know others person hand is clean or not. It is the way to spread germs. So several leaders of the world and others are now joining their hands to say Hello or Hi.