What's Podcasting?

Do you know the word "Podcasting"?
Using an ipod, we can downroad not only music but also netradio. And as far as netradio concerned, we can use almost free. It sounds so useful to staudy English. Usually we start to learn English when we enter junior higi school. So many people including me have learn since then, so long time. But most people is poor at listening and speaking English. Because , we don' have so much time to use it. But if I do podcasting , it going to be easier to make situations to improve it.Now I don't have ipod , I want it.