What is the most important invention of the last century?

One of the most important inventions of the last century is the internet, as it has fundamentally transformed communication, information sharing, and access to knowledge across the globe. It has enabled instant connectivity and collaboration, fostering social, economic, and technological advancements. The internet has also given rise to new industries and changed how we work, learn, and interact. Its impact on everyday life and society as a whole is profound and continues to evolve.