ELI5: Explain Like I'm 5

OpenCourseWare

OpenCourseWare is a way for people to learn new things without having to pay for classes or school. It’s like a library filled with free online classes and lectures. In OpenCourseWare, teachers put their class materials online, like textbooks, lecture notes, assignments, tests, and videos. You can look at all those materials or just parts of them. Then, you can use those materials to learn about a subject on your own.