Custom link groups are individual links grouped together into sets of links. You can create custom link groups and use effective link group names to suggest relationships or common features each group shares. For example, you could create an Assessments link group that contains links to the Quizzes, Assignments, Surveys, and Self Assessments tools.
When you create a custom link group and add it to a navbar link area, the link group appears as a drop-down menu labeled with the custom link group name.