The term "21ου" refers to the 21st century, which spans from the year 2001 to 2100. This century is characterized by rapid advancements in technology, globalization, and significant social changes. It has seen the rise of the internet, smartphones, and social media, transforming how people communicate and access information. In addition to technological progress, the 21st century has faced challenges such as climate change, economic inequality, and political unrest. Global movements for social justice and environmental sustainability have gained momentum, influencing policies and public awareness worldwide. Key events and figures, such as climate activists and international summits, play a crucial role in shaping the future of this century.