So kiddo, you know how sometimes countries try to compete with each other to be stronger and better, like in the Olympics or in making better cars? Well, there is also a kind of competition between countries when it comes to computers and technology.
This competition is called the "cyber arms race." It's like a big game of trying to make better cyber weapons, and finding ways to protect yourself from other people's cyber weapons.
Just like in the real world, some countries want to have more powerful cyber weapons so that they can use them if they need to defend themselves or attack someone else. They might try to create really sneaky viruses that can go into another country's computer systems and mess things up, or they might try to hack into other countries' secret information to learn important things that could give them an advantage.
But then, other countries don't want to be defenseless against these cyber attacks, so they work really hard to make better ways to protect their computer systems. It's like building a strong castle with walls and gates that nobody can break into easily.
This cyber arms race can be dangerous because it can lead to countries using their cyber weapons against each other, which could hurt innocent people and cause a lot of problems. That's why it's important for countries to try and work together to find ways to keep everyone safe online.