What is the Difference Between a Video on the Internet and a Podcast?

What makes podcast different from a video on the Internet is subscription based delivery system. When you subscribe to a podcast, the following podcasts are delivered automatically to your computer when you are in iTunes. Podcasts do not have to; but they can be carried to a portable media player (e.g. iPod) and be played whenever and wherever you want to. The listener can listen to/watch the podcast without having to return to a spesific site to see if there are new podcasts available to be downloaded.