Utility Navigation definition from Nielsen:
Summary: Utility navigation consists of secondary actions and tools,
such as contact, subscribe, save, sign in, share, change view, print.
These activities strongly affect website visitor satisfaction, user
experience, and engagement. Put utilities where people expect and need
Primary vs Secondary Navigation
Primary navigation stands for the content that most users are
interested in. But importance is relative; the type of content linked
from the primary navigation on one website may be the same kind linked
from the secondary navigation on another (for example, general
information about the company or person).
Secondary navigation is for content that is of secondary interest to
the user. Any content that does not serve the primary goal of the
website but that users might still want would go here. For many blogs,
this would include links for “About us,” “Contribute,” “Advertise” and
so on. For other websites, the links might be for the client area, FAQ
or help page.
Other types of Navigation (Structural, Associative, Local, Contextual, etc)
Antharia: Understanding Site Navigation: Key Terms (Part 1) (this is a zip file)