A virus is a program that is able, once executed, can infect files in order to reproduce, making copies of itself, without being observed by the user. Viruses are harmful to the operating system and involve a certain waste of resources in terms of RAM, CPU and disk space. As a general rule it is assumed that a virus can directly damage only that, but it can also indirectly cause damage to hardware, such as causing the overheating of the PC.
first things were very different, since there was still the common anti-virus, there was no opportunity to defend themselves from these dangerous attacks, and the solutions to escape the virus were very few, if any. Then we arrived in the 21st century, things have changed, antivirus, firewall, and then, by the intrusion of viruses have been reduced but not eliminated, we are still victims of attacks, despite having installed a good anti-Software virus.
types of viruses more widespread and more hazardous .... here is a virus and the various types of classification.
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