Difference Between Viruses, Trojans, Worms, and Other Malware?

"Lifehacker's tech-savvy readers are the first people on speed-dial when it's time to heal an infected PC, but how much do you really know about viruses, spyware, scareware, trojans, and worms? Here's a helpful guide to understanding all the different types of malware."

[via lifehacker]