Podcasts are digital audio programs, on almost any topic imaginalble, done by professionals and amatures alike. Kind of like radio programs that you can download and listen to whenever you want. For the most part they have little to no advertising and the best part is that they are almost all free. You can subscribe to one and have your device automatically download new ones, or just pick and choose what episodes you would like to listen to. There are podcasts from big broadcasters like CBC and BBC, and also hobbyists and people with an interest in a certain topic. That being said, some of the more amature ones can be pretty brutal and hard to listen to, and that is sort of the beauty of them, you can hear from episode to episode how people are learning as they go along and get better and better. The ones that are created by the bigger media companies are pretty polished and the production is spot on.
I have been listening to podcasts for a number of years now, on and off. Right now I am back to listening to them. I have quite a long commute so its great to listen to something I am interested in, for the most part, without commercials. The podcast app is standard on most iOS devices and probably the least understood and under used app. Once you go into the app and go to the “Featured” section, you are presented with something like the app store for podcasts. You can find a program on almost any topic, no matter how obscure. Just try searching for any topic at all and if you don't find at least one hit I would be surprised. As an example these are just a few of the ones that I am currently listening to.
As you can tell you can find some very obscure and strange topics as well as some great mainstream podcasts. You can listen to them when ever and where ever you want at your own pace. You can also limit how many download. This screenshot is from my ipad but on my iPhone I have a limit of only the latest three episodes and I have it set to automatically delete anything older or any that I have already listened to. That way I don't have 20 episodes to listen to if I don't get a chance to get to listen to them.
If you haven't checked out the podcast app in your device you might want to have a look at it.