Stuxnet is an extremely sophisticated computer worm that exploits zero-day vulnerabilities to infect computers and spread. Its purpose was not just to infect PCs but to cause real-world physical effects. It targets centrifuges used to produce the enriched uranium that powers nuclear weapons and reactors. The classified program to develop the worm was given the code name “Operation Olympic Games”; it was begun under President George W. Bush and continued under President Obama. It took a team of ten coders two to three years to create the worm in its final form.”]
Source: https://www.csoonline.com/article/3218104/what-is-stuxnet-who-created-it-and-how-does-it-work.html