Ontology modularization is a fancy way of saying that we can break down big ideas or concepts into smaller, more manageable pieces. Imagine you have a big pile of Legos that you want to build into a castle. Instead of trying to put all the pieces together at once, it's easier to sort them into smaller piles and work on one section at a time.
In the same way, ontologies are like big piles of concepts and relationships between them. Breaking them down into smaller, more focused parts makes it easier to understand and use them. This is especially important when we want to share ontologies with other people or systems- by modularizing them, we make it easier for others to pick and choose the parts they need, without having to understand the whole thing.
So, to summarize: ontology modularization is like breaking down a big pile of Legos into smaller, more manageable pieces, so we can better understand and use them, and share them with others.