See The Difference Between Adware & Spyware in the Did You Know?  section of Webopedia.
Also see All About Web Browsers in the Quick Reference section of Webopedia.

eSecurity Planet 
A resource for daily information on e-security targeted to IT managers. The site provides users with information from a variety of sources, including experts at security product and services firms, and the consultants who follow the security industry.

Webopedia's "Did You Know...?" Section
Use this Webopedia knowledge section for an in-depth overview of specific technologies and occurrences in the areas of Computer Science, The Internet, and Computer Hardware and Software.

Webopedia's "Did You Know?" Article
The Difference Between a Virus, Worm and Trojan Horse.

Webopedia's Quick Reference Section
Use this Webopedia reference section for information on common Internet and computer facts and occurrences.