📼 A cassette is a small rectangular plastic case that contains magnetic tape used for audio recording and playback. It was a popular medium for music and other audio content before the advent of digital formats. The cassette typically has two spools to hold the tape, and it can be inserted into a cassette player or recorder for listening or recording purposes. The tape inside the cassette stores the audio signals in a magnetic form, allowing them to be played back by passing over a magnetic head in the player.