Viruses, Worms, Trojans What are they?

Virus:
Simply put, viruses are (primarily) destructive computer programs created by someone that once run, attempt to destroy the data (files) on your computer. A virus spreads when an infected program is run (executing the virus code), which in turn infects more files on the same machine. This usually happens silently and without your knowledge until its too late. In general, viruses have 1) an infection phase where they reproduce widely, 2) an attack/trigger phase (such as a certain date or time) which causesthem to 3) deliver their “payload”, and do whatever damage they have been programmed to do (if any).

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