You can "subscribe" to receive a podcast, rather like you might subscribe to a magazine and get it delivered each week. All of the BBC's podcasts are free, and you can stop receiving the files at any time. If you'd rather not subscribe, you can download episodes of a podcast series individually.
In order to subscribe for a podcast, you need an internet connection and a piece of podcast software which is usually available free of charge. Once you have installed this software, it will check the BBC for new episodes of your chosen podcast series and automatically download new episodes for you.
To find out more visit http://www.bbc.co.uk/webwise/sharing/index.shtml?initialModule=Pod