The 21st (twenty-first) century is the current century of the Anno Domini era or Common Era, in accordance with the Gregorian calendar. It began on January 1, 2001, and will end on December 31, 2100. It is the first century of the 3rd millennium. The Third Industrial Revolution which began around the 1950s continued into the late 20th century, and started to transition into Industry 4.0 and the Fourth Industrial Revolution in the beginning of the 21st century.
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