(January 26, 2019 at 8:38 am)zebo-the-fat Wrote: I have been using Eset AV for the last 12 years, never had a virus, never caused me any problems, regular updates, very happy with it.
You can't be certain you did never had any virus because there are ways for some of these to hide themselves from AV like polymorphic code ( https://en.wikipedia.org/wiki/Polymorphic_code ) , cryptography , act differently that majority of viruses etc...
A virus is a program that replicate itself in the computer ( https://en.wikipedia.org/wiki/Computer_virus ) unlike worms ( https://en.wikipedia.org/wiki/Computer_worm ) that replicate themselves to others computers.
We can find malware that does not replicate themselves and many of these are trojan horse ( https://en.wikipedia.org/wiki/Trojan_horse_(computing) ).
There are many categories of malware.
For example some trojan horse are worms and others trojan horse are not.
Some spyware ( https://en.wikipedia.org/wiki/Spyware ) are keylogger ( https://en.wikipedia.org/wiki/Keystroke_logging ) but others are not.
