A visual guide to cables
This guide from Radio Shack describes the different types of audio and video cables that are commonly used in AV installations. Clicking on the images of the cables (on the page on the RadioShack site) provides a lot of information about the proper use of different types of cables via FAQs.
NOTE: Some of the information here is specific to ordering from Radioshack, but there is a lot of useful information also available alongside.
Content and image credit (www.radioshack.com)