The font-family property should hold several font names as a "fallback" system, to ensure maximum compatibility between browsers/operating systems. If the browser does not support the first font, it tries the next font.
Start with the font you want, and end with a generic family, to let the browser pick a similar font in the generic family, if no other fonts are available:
http://www.blogger.com/img/blank.gif
Serif Fonts
font-family : Georgia, serif
font-family : "Palatino Linotype", "Book Antiqua", Palatino, serif
font-family : "Times New Roman", Times, serif
Sans-Serif Fonts
Monospace Fonts
http://blog.varadesigns.com/css-web-safe-font-combinations/
