In computer system security, a virus is a type of harmful code or program that self-replicates by placing its code into other programs. A virus is a sort of harmful code or program that, when carried out, reproduces by placing itself into other computer system programs, information documents, or the boot industry of the hard drive. Because of this, trojan horse can spread out throughout a network of computers and create severe damages.https://malwarezero.org/different-types-of-viruses-for-computers-a-beginners-guide/ As a result, infected computers can spread the virus to other computer systems.
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