What is a computer security risk??

This is a very general statement because many things are in fact, computer security risks. The foremost risk would probably come from malicious code like Viruses, Spyware, and Trojan horses. These can be infected on a system or number of systems through exploits in operating system software or web browsing software. Also a common trend is a technique known as "phishing" where a spammer will send an email that looks like its from someone else and by clicking on a link/opening an attachment you may be downloading malware.
Some forms of malware can "phone home" back to the attacker which is how bot-nets are created which can be used to take down entire websites or be used as a launchpad to send lots of spam.
The biggest computer security risk is actually the user behind the computer in most cases. That is why it is important to practice safe internet habits and keep virus protection up to date
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