An audiotape is a thin strip of plastic ribbon coated with magnetic material that can record and play back sounds. Before MP3s and CDs became popular, reel-to-reel audiotape was one of the main ways to record voices, music, and other sounds outside of a recording studio.

The tape works through magnetism: when sound goes into a microphone, it gets converted into magnetic patterns on the tape. To play it back, a machine reads those magnetic patterns and converts them back into sound through speakers. Think of it like writing in invisible ink that only a special machine can read.

Audiotape came in different formats. Large reels of tape were used in professional recording studios and radio stations. Later, engineers figured out how to put audiotape into small plastic cases called cassettes, making it easy for regular people to record and share music, lectures, or messages. Your grandparents might have recorded their favorite songs from the radio onto audiotape, or used a tape recorder to capture family memories.

While digital recording has mostly replaced audiotape today, some musicians still prefer the warm, slightly imperfect sound that analog tape creates. And somewhere in your attic, there might be old audiotapes with voices and songs from decades past, waiting to be played.