Font Table
Within a document, the font table contains information about the fonts used in the document to allow:
Applications to perform substitution with the most appropriate possible font when the desired font face is not available on the system. Since some fonts are commercially distributed, it is possible for a document to be formatted with one or more fonts that are not available depending on the machine opening the current system. This information allows the application that cannot locate the desired font to perform the most appropriate possible match.
Embedding of fonts in the document to prevent the need for font substitution
The font table part is stored via an implicit relationship from either the main document part or the glossary document part, and has a relationship type of http://schemas.openxmlformats.org/wordprocessingml/2006/fontTable, and a content type of vnd-openxmlformats.officedocument.wordprocessingml-fontTable+xml.