Podcast RSS feeds are web-based standardized feeds that groups all relevant data about your podcast including your show's title, artwork, episode details, and a link to the audio file for each episode. The RSS feed helps you distribute your podcast online and gain subscribers or get published on Spotify, Apple Podcasts etc. Usually the podcast host will make your RSS feed automatically for you. You can make it on your own if you store your audio files in your own online file storage (like Dropbox), but it won't be ideal if you have many listeners worldwide.