VIRUS????

A virus is just another computer program made of mainly two parts
1) the replication code
2) the payload

The job of a virus is to go forth and multiply (replication code)
and do something

So essentially, if your calculator software makes copies of itself onto different directories. it can technically be referred to as a virus.

There are thousands upon thousands of computer viruses in the wild. categorize are bwlo given

virus - generic term for a program that makes copies of itself

trojan - a virus that pretends to be a different program.

worm - a virus that actively looks for computers to infect. yes, by itself.
It's like well, a worm..

adware - a virus who's payload is to show/popup ads

malware - trojan version 2. it does something useful but does harm in the
background. they should've called it politician.

jokeware - a vius who's payload is a prank.