The Trojans are just computer programs that can reproduce themselves, but they can do minimal damage from anywhere extremely dangerous. It is usually masquerades as a common file (perhaps a file. MP3 music or file. JPEG image file), but no damage when the computer user opens. That's why you should take extra care when opening the search for suspicious files and it may well be a Trojan horse.
Worms are self-reproducing programs that mainly use security holes in order to propagate across the network itself. If your computer is infected with a worm and is able to reproduce a number of times, it causes your computer to slow down significantly because it uses your computer resources and memory to do so. They often use security vulnerabilities in the operating systems (such as Windows), to reproduce to self-determination.
Email viruses are explicit: they spread by e-mail. Once a user opens the infected email, which he usually does send itself to other users via e-mail addresses in the address book of the user. Because it uses e-mail and a lot of people without really open emails or under scrutiny, it spreads very quickly throughout the world and can cause chaos in just a few days.
Bombs are logical viruses that target applications, causing them to crash (such as Windows). It can also be spread by email or innocently downloading it off the Internet. It can cause a lot of damage (especially if it infects Windows and others), or only a small amount (short program).
Fortunately for computer users, there are anti-virus programs available, whether through the Internet or the computer at the store. These programs are targeted specifically at thousands of viruses and wipe them from your own system (if infected), or guard against attacks (if not yet infected).
Anti-virus programs are updated regularly (usually every day), because there are always new virus definitions every day, and these new viruses can infect. These software developers are always looking on the latest viruses to make sure you, the user, are protected against the virus as much as possible. Your PC safety and security are still under consideration.
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