>I’ve read somewhere that a world war will not happen anymore because there are constant cyber wars.
The main factor preventing world wars is the globalization of economies. Anyone starting a war will not only ruin trade relations with their target, but likely provoke their business partners into imposing economic sanctions
>What goes on during cyber wars across countries?
Mostly espionage. Countries try to gain intel on rivals and or carry out sabotage. For instance, the US made a virus that spread to Windows PCs indiscriminately, but didn’t do anything nefarious except check if the PC had control over a specific type of motor known to be used by Iran for purifying nuclear material. Then the virus would randomly speed up those motors past what is safe, causing explosions on any such motors being used to refine nuclear weapons. This set back Iran’s nuclear program considerably.
>Are there certain countries that work together and attack other countries?
While this is possible, I don’t consider it likely. Unless one country is a satellite country of the other (basically subservient to the bigger country). Working together on a cyber attack is likely to tip one country’s hand to the other’s spy network, which is something they’d otherwise place a high priority on keeping secret.
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