Subjects and prices vary enormously, ranging from accounting to zoology; some classes are free, while others cost hundreds of dollars.

　　Is Online Learning for You?

　　Typically, online classes are targeted to working adults--people who want to get an advanced degree or acquire new skills for their jobs, but don't have time to regularly attend classes. Classes are open to anyone, but you may need some prerequisites before you can enroll in certain courses. The requirements are usually listed along with class descriptions.

　　Online learning works best for people who are self-motivated, enjoy working alone at their computer and feel comfortable using technology. Beyond that, it's just one of those things you have to try.