The wai is a graceful, totally unique action practiced throughout Thailand. It plays a very important part in showing respect, and is central to Thai etiquette. For the most part Thais do not want to touch your sweaty, grubby little hands, so it's a good idea to learn how to wai. The European kiss-on-each-cheek-greeting will certainly alarm a Thai, especially if you are a man doing this to a woman who isn't your wife or girlfriend!