When it comes to free apps, there still may be a price, although it doesn’t always cost the user. There are other ways applications can earn revenue, such as running advertisements within the app itself.

With the threat landscape changing so rapidly, it is wise to understand what your antivirus software has to offer.

Spam. In some ways, it's the electronic equivalent of junk mail and junk phone calls. Spam is not only an unsolicited and annoying nuisance, it's also a pervasive problem that's clogging and overwhelming the Internet's email systems. Spam accounts for approximately 80 percent of worldwide email volume.

Borrowed from the story of the wooden horse used to trick the defenders of Troy into sneaking soldiers into their city, a Trojan Horse hides malware in what appears to be a normal file.