Magnetic tape is a long, thin strip of plastic coated with a magnetic material that stores information. When you record sound or data onto magnetic tape, tiny magnetic particles on the tape's surface get arranged in specific patterns, like invisible writing that special machines can read back later.

For decades, magnetic tape was everywhere. Musicians recorded albums on it. Movies were stored on it. Computers used it to save important data. The cassette tapes your parents or grandparents might have used for music were magnetic tape wound up inside a plastic case. VHS tapes that played movies were magnetic tape too.

Magnetic tape worked brilliantly because you could record over it again and again, erasing the old magnetic patterns and creating new ones. It was also much cheaper than other storage methods at the time. A single reel of tape could store huge amounts of information.

Today, most people use digital files, streaming services, and hard drives instead. But magnetic tape hasn't disappeared completely: many companies still use modern versions of it to back up huge amounts of data, since it remains one of the most affordable ways to store information for a long time. The technology that seemed so futuristic in the 1950s now feels charmingly old-fashioned, but it helped launch the entire digital age.