What does podcast mean?

To many of us the word  podcast  is a new term, although  it was first mentioned in 2004,  by Ben Hammerslay in a newspaper  article. 

The word  "pod" borrowed from Apple's iPod and "cast" taken from radio's broadcast.

The word   is understood as : A Digital  audio  file  made available  on the internet for downloading  to a computer or a mobile. It is typically  available  as a series. 

ipod+broadcast = podcast 

A podcast  audience  may not be large  as radio listeners. 

Every  podcast  has a website, where  the show can be listened. 

Nowadays  it is used  extensively  by bloggers  and politicians to put forth their ideas, views  and also  for promotions.