The Twenty-First Century began on January 1, 2001, and is characterized by rapid advancements in technology and communication. The rise of the internet and smartphones has transformed how people connect, share information, and conduct business. Innovations in fields like artificial intelligence, renewable energy, and biotechnology are shaping modern society. This century has also seen significant global challenges, including climate change, economic inequality, and public health crises such as the COVID-19 pandemic. International cooperation and policy changes are essential to address these issues, as countries work together to find sustainable solutions for a better future.