Basic about computer virus & worms

Virus

A virus (Vital information under seize) is a self replication programs that attaches itself it on executiable file in executed the virus automatically gets executed and enter into the system memory. Once it enters into the system memory it either searches for other file that can be infected or stays in background and infect the file that are uses the virus infected programs.

WORMS

Worms are very similar to viruses but differ in way that they don't bind themselves they uses the network if we find excessive use of our networks bandwidth then we may be infected by a worm, so a worm don't require a  user to execute any file for it execution.