A podcast is an episodic series of digital audio or video files
Which podcasts do you like to listen to? 
Today there are more than 115,000 English-language podcasts available on the internet!    I like sports ones like Bill Simmons
That is a lot of podcasts.  Who exactly is Bill Simmons? 
Simmons first gained attention with his website as "The Boston Sports Guy" and was recruited by ESPN in 2001
Is his podcast still popular? How many people listen to his podcast? 
Lots!    Just recently He became the founder and CEO of The Ringer, a sports and pop culture blog and podcast network 
What type of pop culture topics do they cover?