HowStuffWorks -- Computer Section
Look at the computer section. You will find information about CD Burners, RAM, Viruses, servers, hardware, peripherals, Security, Software, and much more. HowStuffWorks is widely recognized as the leading source for clear, reliable explanations of how everything around us actually works.
Website : http://computer.howstuffworks.com/

  Karbosguide.com
Find information about the basics of computer components: Digital Data, Motherboard logic, CPU and RAM, Disks and drives, PC Interface, System software, Monitors & Sound, Digital Imaging.
Website : http://www.karbosguide.com/

PC Guide -- Systems and Components Reference Guide
This is a section of the PC Guide that contains comprehensive descriptions of the major parts of a modern personal computer, structured based on the various PC systems and components. Explore the links on the left-hand of the screen.
Website : http://www.pcguide.com/ref/index.htm

Webopedia.com
Are you looking for a definition related to the Internet, the WWW, or computers? This is a very good place to start.
Website : http://www.webopedia.com/

Whatis.com
“Whatis.com is a knowledge exploration and self-education tool about information technology, especially about the Internet and computers. It contains over 4,500 individual encyclopedic definition/topics, a number of "Fast Reference" pages and learning tools. Covers everything from computer fundamentals to Internet, software, networking, databases, and more.”
Website : http://whatis.techtarget.com