Imagine you and your friends are trying to decide what game to play. You all have different ideas and no one can agree. To solve this problem, you decide to hold a "meeting" where everyone can share their thoughts and vote on the best game to play.
This "meeting" is kind of like a kurultai. A kurultai is a traditional way of making important decisions in some parts of Central Asia. People would gather to discuss different options and come to a decision as a group.
Just like your game decision, a kurultai could be used to decide things like who should be the leader of a group or what actions to take in times of crisis. It was important for everyone to have a say and feel like their opinions were heard.
So, think of it like a big discussion where everyone gets a turn to talk and then the group makes a decision together.