My question, about viruses, I tried to google but I can not find the answer! What triggers the virus

I know that you could write for example code that replicates a file, but what use is that? And let's say my b-day triggers the virus, but the program has to be ran at first! how do you make it run automatically? And one more thing, give me an example of a virus that actually does damage, because just replicating a file it is no damage except hard drive memory waste!

P.S. I WILL NOT USE THIS INFORMATION FOR EVIL PURPOSES! I AM ASKING JUST BECAUSE CURIOSITY AND AFTER I LEARN ENOUGH ABOUT VIRUSES, JUST SO U KNOW I WANT TO LEARN ABOUT MAKING ANTI-VIRUSES

THANKS

My question, about viruses, I tried to google but I can not find the answer! What triggers the virus?triumph

Sorry -- I think you'll need to look elsewhere. Trading information about viruses (even out of curiosity) has too much of a scent of illegality about it.

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