Imagine you and your friends are playing a game together. Each of your friends has a different role in the game - one friend is the "leader" who makes the big decisions, one friend is the "assistant" who helps out with little tasks, and one friend is the "follower" who does what the leader says.
This is kind of like a "role hierarchy" - each person has a different level of responsibility and authority in the game. The leader is at the top of the hierarchy, followed by the assistant, and then the follower.
In real life, we also have different "roles" or "positions" in different situations. For example, at school, the principal is at the top of the hierarchy and has the most authority. The teachers are next, and then the students.
The role hierarchy helps us know who is responsible for what and who has the final say in certain situations. It can also help things run more smoothly because everyone knows their place and what they're supposed to do.