AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The key innovation was moveable type — Gutenberg developed metal types for each of the 26 Roman alphabet characters and devised a way of moving them around to compose different words, allowing flexible reproduction of varied texts.
Source: Gutenberg and the Printing Press, Chapter 5
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The examiner specifically wants "moveable type printing" as the answer — name the innovation and briefly explain it (metal letters that could be rearranged). Don't confuse this with the press mechanism (screw/platen); that is how it printed, not the flexible part. One crisp line with the term and its function scores full marks.