Word provides three types of tabs on the Ribbon.
The first type is called a standard tab: Home, Insert, Review, View, and Add-Ins.
The second type is called a contextual tab: Picture Tools, Drawing, or Table.
A contextual tab appears only when they are needed based on the type of task.
The third type is called a program tab, for example Print Preview.
A program tab replaces the standard set of tabs when you switch to certain views or modes.