Sin Sod is dowry, paid by the groom to the bride's family

The Thai dowry system is known as the 'Sin Sod'. Traditionally, the groom will be expected to pay a dowry or sin sod to the family, to compensate them for the loss of their daughter. The dowry or sin sod is also to demonstrate that the groom is financially capable of taking care of their daughter.Usually, the dowry is symbolic and will normally be returned to the couple after the wedding.
Dowry however does not play a role when registering a Thai marriage. There is no need to show that dowry had been paid as it is not part of the legal system. Dowry is a tradition not a law.