The Y2K bug, also known as the Millennium Bug, was a computer programming issue that arose as the year 2000 approached. Many computer systems used only two digits to represent the year, so the year 2000 would be read as 00. This could lead to errors in calculations and data processing, potentially causing systems to fail or produce incorrect results. As the new millennium approached, businesses and governments worldwide invested significant resources to fix the Y2K bug. They updated software and hardware to ensure that systems would function correctly. Fortunately, when January 1, 2000, arrived, most systems operated smoothly, and major disasters were largely avoided.