Podcasts are audio or video digital media files that are often produced as part of a series. When a podcast is created as a series, it can be easily subscribed to using an RSS aggregator. The use of an RSS aggregator allows podcast episodes to be automatically downloaded to a teacher or student device. This is advantageous, as teachers and students are not responsible for repeatedly checking for new episodes, they will download automatically when ready. Notifications can be set up as well to alert the user to the presence of a new podcast. Podcasts can be a very useful tool in the ESL classroom. Podcasts can be created by the instructor for ESL students who struggle with following the pace of in-class discussions, created by the ESL student to show understanding of key concepts and necessary skills such as reading, writing, listening, and speaking, or podcasts not created by the instructor can be listened to by ESL students to help solidify critical English language skills.