Podcasting involves creating and distributing audio files online for others to listen to, similar to radio broadcasts or television episodes. It became popular in 2004 when the terms "podcast" and "podcasting" were coined by combining "iPod" and "broadcasting". Creating podcasts requires a microphone, recording/editing software, and publishing platforms. Podcasts can be published for free on sites like Podbean which then allow people to subscribe via RSS feeds. Advertising is a way for podcasters to make money, with ads typically inserted at the beginning, middle, or end of episodes. Popular podcasts on iTunes and Podcast Alley cover topics like comedy, news, and education.