Malware is considered any type of malicious software.
Malware And How It Sucks
Malware usually comes in form of emails. All you have to do is reply, click on the link that the email gives you, or give them any of your information and you could get a virus. Even if the link is legit the scammer still gets away with you information.
How To Avoid Malware
To avoid malware you need a good filter, a good firewall and, or just common sense. Lots of nasty viruses can be avoided just by thinking if your walking into a software trap or not.