MALWARE is a term used for MALicious softWARE and is generally used to refer to the following:

 - VIRUSES [self-replicating programs attached to other executable programs]

 - SPYWARE [malware that takes partial control without your consent]

 - ADWARE [software that automatically displays ads once you've installed the software]

 - WORMS [self-replicating programs]

 -TROJAN HORSES [malicious programs embedded in legit software].