Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more. It’s all free for …

Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology — Khan Academy's...

Khan Academy is a nonprofit providing a free, world-class education for anyone, anywhere. Our interactive practice problems, articles, and videos help students succeed in math, biology,...

Khana, also known as Dak or Lilavati, was an Indian poet, philosopher and legendary astrologer, who composed in the medieval Bengali language between the ninth and 12th centuries AD.

Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology — Khan Academy's personalized …

Regardless of who you are, mastering even just one more skill on Khan Academy results in learning gains. Log in now!

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a …

Our mission is to provide a free, world‑class education for anyone, anywhere. With practice exercises, instructional videos, and a personalized learning dashboard, Khan Academy empowers learners to …

Grammar is the collection of rules and conventions of a language. Whether you're learning English for the first time or just looking to improve your speaking and writing skills, this course is your …

Khan Academy offers the only official SAT Reading and Writing prep, in partnership with College Board. By mastering this course along with Khan Academy's SAT Math course, and regularly taking official …