Khan Academy is a not for profit organization dedicated to providing high-quality educational materials free of charge to anyone who desires to learn. Launched in 2008, the Academy has more than 4,200 videos covering subjects including math, science, economics, humanities, and computer science. The organization is able to offer its extensive video library, interactive challenges, and assessments at no cost thanks to supporters like the Bill & Melinda Gates Foundation, Bank of America, and Google.