Knowing About Web Safe Fonts
http://www.wpdfd.com/issues/87/knowing_about_web_safe_fonts/

Rodriguez, David
Web Page Design for Designers
2008

Abstract:

What are Web safe fonts? Practically every personal computer has a set of fonts installed. These fonts are usually put there by the computer manufacturer or are the default sets of fonts for the operating system that computer is using. It's possible to install additional fonts on your own. However, not all font sets are created equal. Different computers can have very different sets of fonts installed, and most casual computer users never know the difference.