What type of UML diagram would primarily focus on the workflow of individual activities?

An Activity Diagram is specifically designed to illustrate the workflow of individual activities within a system. It visually represents the sequence of actions or tasks that occur, along with the conditions and decisions that may influence the flow. This type of diagram is particularly useful for understanding the dynamics of processes, including parallel activities, synchronization, and branching paths, which helps in clarifying how different actions are interconnected in a workflow.

In contrast, other types of UML diagrams serve different purposes. A State Diagram focuses on the different states an object can be in and how it transitions from one state to another, emphasizing the lifecycle of an object rather than the activities performed. A Component Diagram outlines the components or modules of a system and their relationships but does not delve into the sequence of actions performed. A Class Diagram depicts the static structure of a system by representing classes and their attributes and relationships, rather than the workflows or activities that occur. Thus, the Activity Diagram is the most appropriate choice for modeling workflows of individual activities.