The Open Content Alliance is like a big library where people can get books, articles, and other information for free. It's like when you go to a library with your parents and borrow a book, but instead of going to the library, you can find the resources on the internet. The people who make the books and articles can agree to let people use their work for free. This is called "open content" because it's open for everyone to use. It's like sharing your toy with your friends at school. The Open Content Alliance wants to make it easy for people to find and use free information.