The International Heavy Haul Association is a group of people who work together to figure out the best ways to move really big and heavy things, like huge machines or buildings, from one place to another all around the world. They talk about different ideas and ways to do this, and they also try to make sure that it's done safely and without causing too much damage to the environment. It's kind of like a big club where grown-ups who are interested in moving really big things get together to share their knowledge and ideas.