Webopedia is a great starting point for finding definitions of most common computer terms. The definitions given in Webopedia are not too technical being written in a way that is easy to understand.
For example, here's the entry for USB Flash Drive:
"A small, portable flash memory card that plugs into a computer’s USB port and functions as a portable hard drive. USB flash drives are touted as being easy-to-use as they are small enough to be carried in a pocket and can plug into any computer with a USB drive. USB flash drives have less storage capacity than an external hard drive, but they are smaller and more durable because they do not contain any internal moving parts. USB flash drives also are called thumb drives, jump drives, pen drives, key drives, tokens, or simply USB drives".
Links are also provided to definitions of other relevant terms, where appropriate.
The only drawback is that images/diagrams are not provided for every definition. That said, Webopedia is still a very useful resource for those learning or interested in ICT.
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