The Lean Startup has become much more than just a book and a methodology. The author (Eric Ries) refers to it as a movement. And it truly is. The ideas put forward in the book have changed how most of the (tech) world approaches starting new companies, but also how many large corporations approach innovation.
Inspired by the broader lean movement, made famous by Toyota, Eric has applied the same basics to innovation, such as small rather than big batches. While the original ideas were all about production, Eric felt that they could help him with an issue he had when starting a new business.