What is a Podcast?
A podcast is like a radio show, but accessed via internet and on-demand (i.e. always available). Access to podcast can be done through an internet browser (like this site) or through phone or desktop apps (such as iTunes, Spotify, etc.). Using phone apps makes listening easy where ever you go and can connect with many car audio systems via Bluetooth.
However Note: All podcasts are downloaded audio files and will use data. If you use a phone, best to use a Wi-Fi connection if you have a limited data plan to prevent over-usage charges.