What does it mean for Thai people to nod their heads after folding their hands?

Thai people greet people and friends with folded hands. The younger generation will also exchange ten gifts with Xiang Chang and say "Sawadika", which means "Hello". Because Thailand is a pure Buddhist country, many of their cultural customs are closely related to Buddhism, such as the exchange of ten gifts mentioned here, but not all Buddhists will do this etiquette when they meet again, only Thais will do it when they meet.