Blog radio shows

While looking for ways to promote my mystery, I came across advice to seek out "blog radio shows." Is this the same thing as a podcast? (As you can probably tell, terms used on the internet are a foreign tongue to me.)

I'm guessing blog radio shows are run by bloggers via Skype. I've seen a few blogger interviews (or maybe they're podcasts), but they seem to be aimed at writers.

I'm looking for some that're aimed at fiction readers. I've browsed a lot of blogs that review mysteries, but haven't found one that does radio interviews.

Anybody know of sites which interview fiction writers, and are aimed at readers?