Okay, kiddo, imagine some people live in a jungle far, far away. They don't use money like we do. Instead, they give each other gifts. One of these people is named Ongka. He wants to become a big man in his group, so he decides to have a really big gift-giving party, called a moka, to show how generous he is.
Ongka spends years collecting lots of pigs, which are really important to his people. He has to trade with other clans and work really hard to get all these pigs. But when he sees all the pigs he has, he feels really happy and important. Now, he's ready to give them away at his big moka party.
He invites people from other villages to come to his party. They all bring gifts, too, but Ongka wants to give away more and better gifts than anybody else. So, he starts by giving pigs to the closest relatives first, like his sons, his brothers, and his wife's family. These people are grateful and impressed. Then he goes to his neighbors, and their families, giving away more and more pigs.
Finally, Ongka reaches the other village's big man, the guy who holds the most power. He gives him the biggest pig of all. The other big man is so happy and surprised that he promises to give Ongka an even bigger gift when he has his own moka party.
Now, Ongka feels really good, and others respect him a lot. His pigs made many people happy, and he gets lots of gifts in return. This is why the big moka is so important among these people. It's a way to show how generous and powerful they can be, and it helps them build good relationships.