Apple on Thursday announced that iTunes U, the educational arm of iTunes, has topped 1 billion downloads.

“It’s inspiring to see what educators and students of all types are doing with iTunes U,” said Eddy Cue, Apple’s senior vice president of Internet Software and Services. “With the incredible content offered on iTunes U, students can learn like never before―there are now iTunes U courses with more than 250,000 students enrolled in them, which is a phenomenal shift in the way we teach and learn.”

According to Apple there are more than 1,200 universities and colleges, and 1,200 K-12 schools and districts involved in iTunes U. Course material spans many topics including the arts, sciences, health and medicine, education and business, among many others.

Apple said that iTunes U is the world’s largest online catalog of free educational content. Some of the world’s top schools participate in iTunes U, including Duke, Yale, Cambridge, MIT and Oxford.