Okay kiddo, so you know how sometimes when you go to a really large sports game or concert, the performers or important people will stand on a special stage called a podium so that everyone can see them better? Well, in ancient times, they didn't have big stadiums or arenas like we do now, but they still had important events where lots of people wanted to see or hear what was going on. So, they built something called a tribune.
A tribune was like a special platform or stand that was built up high so that people could see and hear important people, like kings, leaders, or officials, better. It was like a raised platform made out of stone or wood, with a staircase or ladder leading up to it. Sometimes the tribune would be covered with a canopy or awning to give shade to the person standing on it.
Tribunes were really important in ancient times because they were a way for leaders to communicate with large groups of people all at once. But they weren't just used for speeches or announcements - sometimes they were used for special ceremonies, like when someone became a king, or when soldiers returned from war.
So, basically, a tribune is a special platform or stand that was built high up so that people could see important people better. It was used in ancient times for leaders to communicate with large groups of people, and for special ceremonies.