A popular podcast is 'SERIAL, ' which is a podcast created by the creators of the public radio program 'This American Life.' It follows one story over the course of a season, with each episode covering a different facet of the story. The first season of SERIAL focused on the 1999 murder of Hae Min Lee and the subsequent conviction of her ex-boyfriend Adnan Syed. It was a huge success, becoming the fastest podcast to reach 5 million downloads and streams.