Can anyone explain what a podcast is and whats it used for?

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Hi,

Can anyone explain what a Podcast is and whats it used for?
I keep hearing about this and not really sure what it is or what its about.
Please help.

I didn't find the right solution from the Internet.

References:
www.cnet.com/forums/discussions/can-anyone-explain-what-a-podcast-is-and-whats-it-used-for-318353/
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Thanks