What is the etiquette for Thai people to put their hands together when they meet? What is the origin? What's the moral?

Meet in Thailand, Myanmar, Laos, Cambodia, Nepal and other Buddhist countries to worship. This worship originated in India. At first, it was just a worship ceremony between Buddhists, and later it developed into a national meeting ceremony. In Thailand, when you have a ten-fold ceremony, you usually fold your palms, straighten your fingers, raise them to your chest, bow your body slightly, and lower your head slightly, and say "Sawati". "Sawati" is Sanskrit, which means ruyi. When you meet people with different identities, the gestures of this ceremony are also different. For example, when the younger generation salutes their elders, they should raise their hands to their foreheads, raise them to their faces after the palms are closed, and put their thumbs near the tip of their noses. The head of the male saluter should be slightly lower, and the female saluter should take a step forward with her right foot and bow slightly except for her head slightly lower. When the elders reciprocate, they just need to put their hands together on their chests. When meeting the king or important members of the royal family, both men and women must kneel. When the king and other important members of the royal family responded, they just nodded. No matter how tall a person is, he should salute a monk. Monks don't have to reciprocate.