All over the world, people who are romantically involved often hold hands.
In France, people touch cheeks and kiss each other lightly when they greet.
In the U.S., it is a sign of friendship to put your arm around someone's shoulder.
In Colombia, close male friends hug and slap each other on the back.
Shaking hands is the most accepted gesture of introduction for businesspeople all over the world.
In Japan, businesspeople often greet each other by bowing.