VIRUS is a piece of code that is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.
VIRUS is stands for "Vital Information Resource under Siege"
Different types of VIRUS:
1. Boot Viruses
2. Program Viruses
3. MultiPartite Viruses
4. Stealth Viruses
5. Polymorphic Viruses
6. Macro Viruses
7. Active X Viruses