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The filmstrip is a form of still image instructional media, once widely used by educators in primary and secondary schools (K–12) and for corporate presentations (e.g., sales training and new product introductions). It was largely made obsolete by the late 1980s by newer and increasingly lower-cost full-motion videocassettes and later on by DVDs. From the 1920s to the 1980s, filmstrips provided an easy and less expensive alternative to full motion educational films, requiring little storage space and being very quick to rewind for the next use. Filmstrips were durable and rarely needed splicing. They are still used in some areas.