BIG SHOUT OUT TO CSSFONTSTACK.com for putting this together!
What are Web Safe Fonts?
Web safe fonts are fonts that are pre-installed by many operating systems. While not all systems have the same fonts installed, you can use a web safe font stack to choose several fonts that look similar, and are installed on the various systems that you want to support. If you want to use fonts other than ones pre-installed, as of CSS3, you can use Web Fonts.
Sans-serif
Arial
Arial Black
Arial Narrow
Arial Rounded MT Bold
Avant Garde
Calibri
Candara
Century Gothic
Franklin Gothic Medium
Futura
Geneva
Gill Sans
Helvetica
Impact
Lucida Grande
Optima
Segoe UI
Tahoma
Trebuchet MS
Verdana
Serif
Big Caslon
Bodoni MT
Book Antiqua
Calisto MT
Cambria
Didot
Garamond
Georgia
Goudy Old Style
Hoefler Text
Lucida Bright
Palatino
Perpetua
Rockwell
Rockwell Extra Bold
Baskerville
Times New Roman