Audio learning involves using audio recordings to deliver educational content to students. It allows learning to take place anywhere and anytime since audio resources are widely available online and in stores. Audio learning first emerged in 1944 to provide textbooks to blind soldiers returning from World War II. Today, audio learning media includes mp3s, podcasts, CDs and digital files and is used by students of all types from young children to older learners. When combined with other learning methods, audio learning multiplies the effects on learning.