The Abbaye de Créteil is a really old building that used to be a monastery a long, long time ago. Monks used to live there and pray and do good deeds for their community. But now, the building has been turned into something else, and people use it for different things.
Think of it like a big, old house that used to belong to a family, but now it's been converted into a store or a restaurant. The Abbaye de Créteil is kind of like that, except instead of a regular house, it was a special place where monks lived and did good things.
Nowadays, the Abbaye de Créteil is used as a cultural center where people can go to learn about different types of art and music. People can go there and see plays, movies, concerts and other shows. It's a great place to go if you want to be surrounded by creativity and beauty. Even though it's not a monastery anymore, the Abbaye de Créteil is still an important part of the community because it brings people together to appreciate and enjoy the arts.