Malware
What is it?
Malware is a software that is trying to damage your computer, or steal personal information.
What does it look like?
Malware can come in the form of viruses, which you can download by opening an attachment. Trojan horses are also used, as well as spyware.
Avoiding!!
You can put AnitVirus Software on your computer, as well as a Firewall. Something that also helps you avoid malware, is using common sense.