Malware is a virus that copies itself. Malware needs a contact to spread the virus. Two viruses that are in malware is Trojan Horses and Spyware. Trojan Horses is a site that seems legit but allows access to someone else. Spyware is a tool that secretly obtains personal information.
How to Avoid Malware!
To avoid malware you need an AntiVirus Software, a Firewall, and of course common sense.