Product designers have tools they use to define activities, tasks, actions, and operations such as activity diagrams, wireframes, and prototypes.
Product Design develops prototypes to elicit customer feedback to validate the solutions activities, tasks, and actions meet their needs. Wireframes are a quick and easy way to prototype a design for feedback. Wireframes are a basic visual guide used to suggest the layout and placement of fundamental design elements in the interface design. They provide a visual reference for the structure of the screens, define the positioning of global and secondary levels of information hierarchy, and maintain design consistency. It is a way to visually represent the activities, tasks, and actions.
With wireframes, designers validate the general workflow navigation, information grouping, information hierarchy, terminology, labels, and general interactions in terms of activities and tasks that need to be complete to meet the customers’ goals. Wireframes and lo-fidelity prototypes, in general, should be void of all color, fonts, icons, graphics, etc. to keep the focus on the overall workflow, activities, tasks, and general information design.
When solving problems for the broader market, these prototypes allow you to validate where various customers’ workflow and content overlap and differ, and start thinking about the right design solution to support the differences in their workflow, activities, tasks, and content.
You can read more in this article – Defining and Designing Technology for People