How to prevent Malware from getting on your computer
Get an antivirus software, update it constantly if it doesn't update itself.
Common sense, if something looks fishy, DON'T GET ON IT!
Types of Malware
Copies itself illegally, intended to shut down or break a computer, needs contact to spread.
Seems legitimate but allows access to someone else onto your computer.
Something that gets on your computer and secretly obtains your personal information.