Before movable type, people used block printing, where the printer prints a whole page from one piece of metal or wood. With movable type, the printer makes a letter (A, B, C ...) from a piece of metal or wood, and can use it again and again in different words. Together, all Gutenberg's inventions made printing fast. In Renaissance Europe, the improved information technology made an information explosion – in a short time, people printed many new books about many topics.