The document discusses design thinking and how it was applied by Arunachalam Muruganantham, known as Padman, to address the issue of lack of access to affordable sanitary pads in rural India. It describes the phases of design thinking - explore, ideate, create and evolve - and how Padman went through each phase, from exploring the problem to creating prototypes to evolving his product. It explains how through perseverance and design thinking, he was able to invent a low-cost machine to manufacture sanitary pads affordably, helping many women while also receiving recognition with the Padma Shri award.