Okay, so imagine there is a big book where all the houses and buildings in Europe are listed. This book is called the "European Land Registry." Now, there are a lot of people who work together to make sure this book is accurate and up-to-date. They call themselves the "European Land Registry Association."
These people make sure that when someone buys or sells a house or building, it gets recorded in the book. They also make sure that the information in the book is correct, so people don't get confused about who owns what land.
Think of it like a really organized library, but instead of books, they keep track of all the buildings and land in Europe. And the people in charge of the library make sure everything is in its right place and easy to find.
So, the European Land Registry Association is like a group of librarians, but instead of books, they take care of the "land book" for all of Europe.