What is what does y2k mean?

Y2K stands for Year 2000. It was a computer programming problem that occurred at the end of the 20th century when many computer systems used only two digits to represent the year. This meant that when the year 1999 changed to 2000, these systems would read it as 1900 instead of 2000, potentially causing serious errors in computer systems worldwide. This issue prompted a massive effort to upgrade and fix computer systems before the start of the year 2000 to avoid any potential disasters. The Y2K problem was solved successfully, and no major incidents occurred on January 1, 2000.