Online high schools are becoming more popular for both teenage and adult students. In my latest About.com article, I explain the difference between the four most popular types of online high school programs. Here's a blurb:

"Not all online high schools are created equal. Private programs offer quality at a high price tag. Public online high schools educate students for free but aren't available in all areas. Students can also earn a diploma at no cost from online charter schools. However, these programs are sometimes unreliable and available only to students living in certain cities. Alternatively, university-sponsored online high schools offer nationwide programs but may have more strict admissions policies."

Check out the article for a more in-depth breakdown of the four types of online high schools.