Lecture recordings are a supplement to traditional face-to-face teaching, whose added value lies primarily in the fact that they create spatial and temporal flexibility for students and teachers. Students gain the opportunity to follow lectures either in the lecture hall or from home. They decide for themselves when and how often to access recorded material. The replayability of recordings helps to reduce language barriers and comprehension problems and to support exam preparation. Teachers can use recorded teaching units to teach the basics without using valuable classroom time (e.g. as a flipped classroom concept), to bridge cancelled sessions or to integrate lecture content from external speakers.