The "third millennium" refers to the period that began on January 1, 2001, and will end on December 31, 3000. It follows the second millennium, which lasted from the year 1001 to 2000. This time frame is significant in various fields, including history, culture, and technology, as it marks a new era in human development. During the third millennium, advancements in technology, such as the rise of the internet and artificial intelligence, are expected to shape society. Global issues like climate change and population growth will also be critical topics, influencing how humanity addresses challenges and opportunities in the future.