What religion spread from india to china, then japan?

I think it is something like Hunda

Hello friend

Ashoka (BCE 270 - BCE 232), the third and the most powerful Mauryan emperor, who created the first pan-Indian empire. After the battle of Kalinga, Ashoka felt immense grief due to the huge loss of lives during the war and thus decided to follow the path of Buddhism. After this, he began to implement Buddhist principles in the administration of his kingdom and named the new code of conduct 'Dhamma'. Here, in order to inform everyone about his new political and ruling philosophy, he got edicts (proclamation) inscribed on stone pillars and placed them throughout his kingdom, which are present even today.