Magnetic recording is a method used to store audio, video, and data by magnetizing a medium. This process involves using a magnetic material, such as a tape or disk, where information is encoded in the form of magnetic patterns. When a magnetic head moves over the medium, it can read or write these patterns, allowing for playback or data retrieval. This technology is commonly found in devices like cassette tapes, hard drives, and floppy disks. The ability to record and reproduce sound or data makes magnetic recording a vital component in the history of media storage and playback.