Open access is like sharing your toys with all of your friends, so they can play with them too. In Portugal, open access means that when people write books or articles or scientific papers, they can make them available for everyone to read and use for free, just like sharing toys.
This means that schools, researchers, and anyone who wants to learn something can go online and find these papers, books, and articles without having to pay for them. This is really nice because sometimes people can't afford to pay for information, but they still want to learn.
So, open access is like being generous with your knowledge and sharing it with people who really want to learn. It's like playing together and having fun while we all learn together.