Khan Academy is an organization with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. Khan Academy's materials and resources are available to you completely free of charge.
How it works for students
Students can make use of the extensive library of content, including interactive challenges, assessments, and videos from any computer with access to the web.
Coaches, parents, and teachers
Coaches, parents, and teachers have unprecedented visibility into what their students are learning and doing on the Khan Academy.