Anglicanorum coetibus is a fancy term that means a special agreement established by the Catholic Church to help people from the Anglican tradition join the Catholic Church.
So let's first understand what Anglican means. Anglican is a type of Christian religion that started in England a long time ago. It is similar to the Catholic Church, but it has some differences in the way it worships and the beliefs it follows.
Now, Anglicanorum coetibus is a document created by the Pope, who is like the boss of the Catholic Church. This document says that if Anglicans want to become Catholic, they can do so in a special way. Instead of just going to a regular Catholic church, they can form their own special groups called "ordinariates."
An ordinariate is like a special club within the Catholic Church just for Anglicans who want to join. This way, they can still keep some of their Anglican traditions and ways of worship while being a part of the Catholic Church.
These ordinariates have their own leaders called "ordinaries," who are like bosses of the Anglicans who joined the Catholic Church. The ordinaries are usually former Anglican priests who become Catholic priests and are responsible for taking care of the Anglican members in the ordinariate.
When an Anglican wants to become part of an ordinariate, they have to go through a process called "conversion." It's like when you switch from one game to another. They have to study and learn about the Catholic teachings and beliefs, and then they can choose to become Catholic by getting baptized or confirmed, just like you become a member of a team by putting on the team uniform.
By having these special groups and rules, Anglicanorum coetibus makes it easier for Anglicans who want to become Catholic to do so while still feeling connected to their Anglican heritage. It helps them find a place in the big Catholic Church family and continue their faith journey in a way that feels right for them.