How to Avoid it.
Any Malicious software.
Viruses, Trojan Horses, Spyware, And how to avoid it
Viruses: Copies itself to spread, used in emails mostly.
Trojan Horses: Seems legit but allows access to your computer from a different location
Spyware: Secretly obtains your personal information.
3 ways to avoid it are; Anti-virus software, Firewall, Common Sense.