A podcast is simply a radio show that you can listen to any day and any time of day you want. Instead of waiting for the radio to play a show, podcast listeners simply have their iPhone or Android phone pull down the podcast (which is simply an audio file) from the internet. Podcast listeners subscribe to podcasts on platforms like iTunes, Google Podcasts, Stitcher and more.
What is a podcaster? A podcaster is simply anybody who makes podcasts. It could be a musician, a comedian, a professor or...a pastor! You preach sermons, which get recorded, which get turned into podcasts hosted on iTunes, which get consumed by your podcast subscribers.
Not too long ago, uploading a sermon to a website was the best you could do. Today, podcast platforms don't merely make a sermon available; they literally push your sermon to people around the world who are searching for what you've preached. If you give the podcast platform the appropriate distribution permissions, your sermon will get heard by people in your community and around the world.