BCA - e-Commerce and Cyber Security

A computer virus is a software or piece of code that is installed on your computer without your permission and runs in opposition to your wishes.
Viruses are capable of self-replication.
All computer viruses are created by humans.
It's relatively straightforward to create a virus that can copy itself over and over again.
Even a basic virus can be deadly since it quickly consumes all available memory, bringing the system to a halt.
A virus that is capable of propagating itself across networks and circumventing security mechanisms is even more deadly.