Magnetic tape is a kind of ribbon material with magnetic layer used to record sound, image, digital or other signals. It is the most productive and widely used magnetic recording material. It is usually made by coating a layer of granular magnetic material on the base of plastic film (support) or evaporating a layer of magnetic oxide or alloy film. Paper and celluloid were used as tape base. Now polyester film with high strength, good stability and not easy to deform is mainly used.
On March 11, 2021, Dutch engineer Ludwig odens, who invented cassette tape, died in the Netherlands at the age of 94, according to Dutch news portal Dutch News quoted by several foreign media.