Audacity is a free, open source digital audio editing program that can be used to create podcasts. It allows users to import and edit sound files, add special effects, and export the final audio in various formats like MP3. The program works similarly to Microsoft Word and movie editing software. It can be downloaded for free from the Audacity website and used on Windows, Mac, and Linux systems. Additional plugins may need to be installed, like LAME, to enable MP3 exporting.