What is a virus?
A computer virus is malware that replicates itself and infects computer data, files, programs, and systems, similar to its namesake that infects human bodies.
How does a virus work?
Viruses always attach themselves to other programs. A virus can make a computer slower, steal private information, take up disk space, corrupt data, display messages, spam the user’s contacts, and log their keystrokes.
Viruses can be guarded against using up-to-date antivirus software.