This document defines key terms related to a company's product mix, including product mix, product line, width, length, depth, and consistency. It explains that a company's product mix has four dimensions: width refers to the number of different product lines, length is the total number of items in each line, depth is the number of versions of each product, and consistency relates to how closely the lines are related. The document provides Unilever as an example, showing two of its product lines for food/drinks and personal care, and the different products that fall under each line to demonstrate the concepts of product mix width, length, and depth.