Rebecca Raichle documents the origins and growth of podcasting from its roots in blogging and mp3 players to its current popularity. Bloggers began creating audio blogs to expand their format, using mp3 files for easy downloading. Researchers like Adam Curry and David Winer then developed a way to automatically upload and synchronize mp3 files, dubbed "podcasting." Podcasting grew rapidly after 2004 as listeners subscribed to current audio files and Apple added podcasts to iTunes in 2005. Podcasting is now a commercial success used in education after its phenomenal growth over 5 years.