Elon Musk's website, X, had a really bad cyberattack that stopped lots of people from using it.
Many people couldn't see their messages or use the app because of a mean attack on the website.
Mr. Musk said this attack was super big and maybe done by a whole country, but he doesn't have proof.
It was like someone threw a big rock at X and broke many, many parts of it. Hopefully, they can fix it!