Font Sets
A font set is a collection of font families. You can create a font set in order to designate the substitute fonts to use when the preferred font is not available on the user's computer. If the first (i.e., preferred) font family in the set is not found on the user's computer, the second font family in the set is used. If the second font family is not found, the third font family is used, and so on. Because different types of computers and operating systems do not always have the same fonts, it is recommended that you try to include fonts that cover all of the circumstances.
Example You want to use Arial if possible. Therefore, you list that font type first in the font set. Next you might add a similar font that is found on Mac computers, such as Helvetica, since Macs might not use Arial. And third, you might add a generic font type, such as Sans-serif. So in the end you would enter Arial, Helvetica, Sans-serif.
Note If you are working with the branding feature, you can choose a font set if one is defined. In the Start New Project Wizard or the Branding Editor, from the FontFamily field, click and select the font set.