A
microform document archival method that consists of large quantities of
16mm or
35mm film that has been put together onto big
spools. Your average roll of microfilm holds about 3,000 images, which is equal to about six weeks of the New York times.
Libraries commonly keep periodicals on microfilm, and will often have special microfilm viewers that will magnify and project the film onto a screen for you. See microfiche.
Spy Movies, especially those involving James Bond, almost ALWAYS involve smuggling important documents on microfilm.