The Gutenberg Bible is the first substantial book printed in the West with moveable metal type. Before its printing in 1454 or 1455, books were either copied by hand or printed from engraved wooden blocks—processes that could take months or years to complete. Johann Gutenberg invented a printing press that revolutionized the distribution of knowledge by making it possible to produce many copies of a work in a relatively short amount of time.
Further information on the Ransom Center’s Gutenberg Bible is available
on the Harry Ransom Centre website.
The British Library holds two copies of the Gutenberg Bible, one in paper and one in vellum; see those digitally here.