Okay kiddo, imagine you're in a library and you need a book. You go to the librarian and ask for help. The librarian knows where all the books are in the library, so they find the book you need and give it to you. Tim O'Reilly is kind of like a librarian for the internet.
He started a company that helps people find information online. But instead of just giving you a book, his company helps you find websites, articles, and data that will help you with your questions or problems. It's called O'Reilly Media.
Tim also came up with some ideas that changed the way people use computers and the internet. For example, he came up with the phrase "Web 2.0" which describes the shift from static websites to interactive ones where people can create and share content with each other. He also created the term "open source" which means people can share and improve software without having to pay for it.
Overall, Tim O'Reilly is a smart guy who has helped people find information on the internet and also came up with some important ideas that changed how we use technology.