"A target market is a group of customers that the business has decided to aim its marketing efforts and ultimately its merchandise towards. A well-defined target market is the first element to a marketing strategy. The marketing mix variables of product, place (distribution), promotion and price are the four elements of a marketing mix strategy that determine the success of a product in the marketplace." [Target market. Wikipedia]
"An onion diagram is a kind of chart that shows the dependencies among parts of an organization or process. The chart displays items in concentric circles, where the items in each ring depend on the items in the smaller rings. ...
The Onion Diagram is able to show layers of a complete system in a few circles. Each of the circles is able to represent a component that is dependent upon the component on the inside of it shown by the circle inside of it. The main concept of the diagram is shown by the center circle of the diagram. This chart is used due to the fact that it has a clear visual representation that is easy to read, and it has a strong visual impact." [Onion diagram. Wikipedia]
This onion diagram (target diagram) example "Target market" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Target and Circular Diagrams solution from the Marketing area of ConceptDraw Solution Park.